JP6427681B2 - Composition, phosphorescent compound and light emitting device - Google Patents

Description

  The present invention relates to a composition, a phosphorescent compound and a light emitting device.

  Organic electroluminescent elements (hereinafter also referred to as “light emitting elements”) can be suitably used for display and lighting applications, and research and development are actively conducted. This light emitting element has an organic layer such as a light emitting layer, a charge transporting layer and the like.

  Patent Document 1 describes a light emitting element having a light emitting layer containing an iridium complex (M0) and a compound (H0) represented by the following formula.

U.S. Patent Application Publication No. 2011/0575559

  However, in the light emitting device described in Patent Document 1 described above, suppression of initial deterioration is not always sufficient.

  An object of the present invention is to provide a composition and a phosphorescent compound that are useful for the production of a light emitting device in which initial deterioration is sufficiently suppressed. Another object of the present invention is to provide a light emitting device in which initial deterioration is sufficiently suppressed.

  As a result of intensive studies to solve the above problems, the inventors of the present invention have found that, in a light-emitting element including an organic layer containing a specific composition or an organic layer containing a specific phosphorescent compound, chlorine atoms The inventors have found that the initial deterioration of the light emitting element is greatly affected, and further, by controlling the chlorine atom to a specific amount, it is possible to suppress the initial deterioration of the light emitting element, and the present invention has been completed. Patent Document 1 does not disclose that the amount of chlorine atoms contained in the light emitting layer affects the initial deterioration.

  That is, the present invention provides the following [1] to [19].

［式中、
Ｍ^１は、ロジウム原子、パラジウム原子、イリジウム原子又は白金原子を表す。
ｎ^１は１以上の整数を表し、ｎ^２は０以上の整数を表し、ｎ^１＋ｎ^２は２又は３である。Ｍ^１がロジウム原子又はイリジウム原子の場合、ｎ^１＋ｎ^２は３であり、Ｍ^１がパラジウム原子又は白金原子の場合、ｎ^１＋ｎ^２は２である。
Ｅ^１及びＥ^２は、それぞれ独立に、炭素原子又は窒素原子を表す。但し、Ｅ^１及びＥ^２の少なくとも一方は炭素原子である。
環Ｒ^１は、５員の芳香族複素環を表し、この環は置換基を有していてもよい。該置換基が複数存在する場合、それらは同一でも異なっていてもよく、互いに結合して、それぞれが結合する原子とともに環を形成していてもよい。環Ｒ^１が複数存在する場合、それらは同一でも異なっていてもよい。
環Ｒ^２は、芳香族炭化水素環又は芳香族複素環を表し、これらの環は置換基を有していてもよい。該置換基が複数存在する場合、それらは同一でも異なっていてもよく、互いに結合して、それぞれが結合する原子とともに環を形成していてもよい。環Ｒ^２が複数存在する場合、それらは同一でも異なっていてもよい。
環Ｒ^１が有していてもよい置換基と環Ｒ^２が有していてもよい置換基とは、互いに結合して、それぞれが結合する原子とともに環を形成していてもよい。
Ａ^１−Ｇ^１−Ａ^２は、アニオン性の２座配位子を表す。Ａ^１及びＡ^２は、それぞれ独立に、炭素原子、酸素原子又は窒素原子を表し、これらの原子は環を構成する原子であってもよい。Ｇ^１は、単結合、又は、Ａ^１及びＡ^２とともに２座配位子を構成する原子団を表す。Ａ^１−Ｇ^１−Ａ^２が複数存在する場合、それらは同一でも異なっていてもよい。］
［２］前記燐光発光性化合物に不純物として含まれる塩素原子及び前記ホスト材料に不純物として含まれる塩素原子の総量が、前記組成物に配合される固形分全量に対して、３．５質量ｐｐｍ以下である、［１］に記載の組成物。
［３］前記塩素原子の総量が、前記組成物に配合される固形分全量に対して、０．８質量ｐｐｍ以下である、［２］に記載の組成物。
［４］前記塩素原子の総量が、前記組成物に配合される固形分全量に対して、０．０１質量ｐｐｍ以上３．０質量ｐｐｍ以下である、［２］に記載の組成物。
［５］前記塩素原子の総量が、前記組成物に配合される固形分全量に対して、０．１質量ｐｐｍ以上０．８質量ｐｐｍ以下である、［２］〜［４］のいずれかに記載の組成物。
［６］前記燐光発光性化合物が、式（１−Ａ）で表される化合物である、［１］〜［５］のいずれかに記載の組成物。

［式中、
Ｍ^１、ｎ^１、ｎ^２、Ｅ^１及びＡ^１−Ｇ^１−Ａ^２は、前記と同じ意味を表す。
Ｅ^１１Ａ、Ｅ^１２Ａ、Ｅ^１３Ａ、Ｅ^２１Ａ、Ｅ^２２Ａ、Ｅ^２３Ａ及びＥ^２４Ａは、それぞれ独立に、窒素原子又は炭素原子を表す。Ｅ^１１Ａ、Ｅ^１２Ａ、Ｅ^１３Ａ、Ｅ^２１Ａ、Ｅ^２２Ａ、Ｅ^２３Ａ及びＥ^２４Ａが複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。Ｅ^１１Ａが窒素原子の場合、Ｒ^１１Ａは存在しても存在しなくてもよい。Ｅ^１２Ａが窒素原子の場合、Ｒ^１２Ａは存在しても存在しなくてもよい。Ｅ^１３Ａが窒素原子の場合、Ｒ^１３Ａは存在しても存在しなくてもよい。Ｅ^２１Ａが窒素原子の場合、Ｒ^２１Ａは存在しない。Ｅ^２２Ａが窒素原子の場合、Ｒ^２２Ａは存在しない。Ｅ^２３Ａが窒素原子の場合、Ｒ^２３Ａは存在しない。Ｅ^２４Ａが窒素原子の場合、Ｒ^２４Ａは存在しない。
Ｒ^１１Ａ、Ｒ^１２Ａ、Ｒ^１３Ａ、Ｒ^２１Ａ、Ｒ^２２Ａ、Ｒ^２３Ａ及びＲ^２４Ａは、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基、アリールオキシ基、１価の複素環基、置換アミノ基又はフッ素原子を表し、これらの基は置換基を有していてもよい。Ｒ^１１Ａ、Ｒ^１２Ａ、Ｒ^１３Ａ、Ｒ^２１Ａ、Ｒ^２２Ａ、Ｒ^２３Ａ及びＲ^２４Ａが複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。Ｒ^１１ＡとＲ^１２Ａ、Ｒ^１２ＡとＲ^１３Ａ、Ｒ^１１ＡとＲ^２１Ａ、Ｒ^２１ＡとＲ^２２Ａ、Ｒ^２２ＡとＲ^２３Ａ、及び、Ｒ^２３ＡとＲ^２４Ａは、それぞれ結合して、それぞれが結合する原子とともに環を形成していてもよい。
環Ｒ^１Ａは、窒素原子、Ｅ^１、Ｅ^１１Ａ、Ｅ^１２Ａ及びＥ^１３Ａで構成されるトリアゾール環又はジアゾール環を表す。
環Ｒ^２Ａは、２つの炭素原子、Ｅ^２１Ａ、Ｅ^２２Ａ、Ｅ^２３Ａ及びＥ^２４Ａで構成されるベンゼン環、ピリジン環又はピリミジン環を表す。］
［７］前記燐光発光性化合物が、式（１−Ａ１）で表される化合物、式（１−Ａ２）で表される化合物、式（１−Ａ３）で表される化合物又は式（１−Ａ４）で表される化合物である、［６］に記載の組成物。

［式中、Ｍ^１、ｎ^１、ｎ^２、Ｒ^１１Ａ、Ｒ^１２Ａ、Ｒ^１３Ａ、Ｒ^２１Ａ、Ｒ^２２Ａ、Ｒ^２３Ａ、Ｒ^２４Ａ及びＡ^１−Ｇ^１−Ａ^２は、前記と同じ意味を表す。］
［８］前記燐光発光性化合物が、式（１−Ａ３）で表される化合物であり、
前記Ｒ^１１Ａが、置換基を有していてもよいアリール基である、［７］に記載の組成物。
［９］前記ホスト材料が、式（Ｈ−１）で表される化合物である、［１］〜［８］のいずれかに記載の組成物。

［式中、
Ａｒ^Ｈ１及びＡｒ^Ｈ２は、それぞれ独立に、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。
ｎ^Ｈ１及びｎ^Ｈ２は、それぞれ独立に、０又は１を表す。ｎ^Ｈ１が複数存在する場合、それらは同一でも異なっていてもよい。複数存在するｎ^Ｈ２は、同一でも異なっていてもよい。
ｎ^Ｈ３は、０以上の整数を表す。
Ｌ^Ｈ１は、アリーレン基、２価の複素環基、又は、−［Ｃ（Ｒ^Ｈ１１）_２］ｎ^Ｈ１１−で表される基を表し、これらの基は置換基を有していてもよい。Ｌ^Ｈ１が複数存在する場合、それらは同一でも異なっていてもよい。
ｎ^Ｈ１１は、１以上１０以下の整数を表す。Ｒ^Ｈ１１は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｈ１１は、同一でも異なっていてもよく、互いに結合して、それぞれが結合する炭素原子とともに環を形成していてもよい。
Ｌ^Ｈ２は、−Ｎ（−Ｌ^Ｈ２１−Ｒ^Ｈ２１）−で表される基を表す。Ｌ^Ｈ２が複数存在する場合、それらは同一でも異なっていてもよい。
Ｌ^Ｈ２１は、単結合、アリーレン基又は２価の複素環基を表し、これらの基は置換基を有していてもよい。Ｒ^Ｈ２１は、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。］
［１０］正孔輸送材料、正孔注入材料、電子輸送材料、電子注入材料、発光材料、酸化防止剤及び溶媒からなる群より選ばれる少なくとも１種の材料をさらに含有する、［１］〜［８］のいずれかに記載の組成物。
［１１］式（１）で表される燐光発光性化合物であって、
不純物として含まれる塩素原子の量が、前記燐光発光性化合物の全量に対して、１５質量ｐｐｍ以下である、燐光発光性化合物。

［式中、
Ｍ^１は、ロジウム原子、パラジウム原子、イリジウム原子又は白金原子を表す。
ｎ^１は１以上の整数を表し、ｎ^２は０以上の整数を表し、ｎ^１＋ｎ^２は２又は３である。Ｍ^１がロジウム原子又はイリジウム原子の場合、ｎ^１＋ｎ^２は３であり、Ｍ^１がパラジウム原子又は白金原子の場合、ｎ^１＋ｎ^２は２である。
Ｅ^１及びＥ^２は、それぞれ独立に、炭素原子又は窒素原子を表す。但し、Ｅ^１及びＥ^２の少なくとも一方は炭素原子である。
環Ｒ^１は、５員の芳香族複素環を表し、この環は置換基を有していてもよい。該置換基が複数存在する場合、それらは同一でも異なっていてもよく、互いに結合して、それぞれが結合する原子とともに環を形成していてもよい。環Ｒ^１が複数存在する場合、それらは同一でも異なっていてもよい。
環Ｒ^２は、芳香族炭化水素環又は芳香族複素環を表し、これらの環は置換基を有していてもよい。該置換基が複数存在する場合、それらは同一でも異なっていてもよく、互いに結合して、それぞれが結合する原子とともに環を形成していてもよい。環Ｒ^２が複数存在する場合、それらは同一でも異なっていてもよい。
環Ｒ^１が有していてもよい置換基と環Ｒ^２が有していてもよい置換基とは、互いに結合して、それぞれが結合する原子とともに環を形成していてもよい。
Ａ^１−Ｇ^１−Ａ^２は、アニオン性の２座配位子を表す。Ａ^１及びＡ^２は、それぞれ独立に、炭素原子、酸素原子又は窒素原子を表し、これらの原子は環を構成する原子であってもよい。Ｇ^１は、単結合、又は、Ａ^１及びＡ^２とともに２座配位子を構成する原子団を表す。Ａ^１−Ｇ^１−Ａ^２が複数存在する場合、それらは同一でも異なっていてもよい。］
［１２］前記式（１）で表される燐光発光性化合物が、式（１−Ａ）で表される化合物である、［１１］に記載の燐光発光性化合物。

［式中、
Ｍ^１、ｎ^１、ｎ^２、Ｅ^１及びＡ^１−Ｇ^１−Ａ^２は、前記と同じ意味を表す。
Ｅ^１１Ａ、Ｅ^１２Ａ、Ｅ^１３Ａ、Ｅ^２１Ａ、Ｅ^２２Ａ、Ｅ^２３Ａ及びＥ^２４Ａは、それぞれ独立に、窒素原子又は炭素原子を表す。Ｅ^１１Ａ、Ｅ^１２Ａ、Ｅ^１３Ａ、Ｅ^２１Ａ、Ｅ^２２Ａ、Ｅ^２３Ａ及びＥ^２４Ａが複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。Ｅ^１１Ａが窒素原子の場合、Ｒ^１１Ａは存在しても存在しなくてもよい。Ｅ^１２Ａが窒素原子の場合、Ｒ^１２Ａは存在しても存在しなくてもよい。Ｅ^１３Ａが窒素原子の場合、Ｒ^１３Ａは存在しても存在しなくてもよい。Ｅ^２１Ａが窒素原子の場合、Ｒ^２１Ａは存在しない。Ｅ^２２Ａが窒素原子の場合、Ｒ^２２Ａは存在しない。Ｅ^２３Ａが窒素原子の場合、Ｒ^２３Ａは存在しない。Ｅ^２４Ａが窒素原子の場合、Ｒ^２４Ａは存在しない。
Ｒ^１１Ａ、Ｒ^１２Ａ、Ｒ^１３Ａ、Ｒ^２１Ａ、Ｒ^２２Ａ、Ｒ^２３Ａ及びＲ^２４Ａは、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基、アリールオキシ基、１価の複素環基、置換アミノ基又はフッ素原子を表し、これらの基は置換基を有していてもよい。Ｒ^１１Ａ、Ｒ^１２Ａ、Ｒ^１３Ａ、Ｒ^２１Ａ、Ｒ^２２Ａ、Ｒ^２３Ａ及びＲ^２４Ａが複数存在する場合、それらはそれぞれ同一でも異なっていてもよい。Ｒ^１１ＡとＲ^１２Ａ、Ｒ^１２ＡとＲ^１３Ａ、Ｒ^１１ＡとＲ^２１Ａ、Ｒ^２１ＡとＲ^２２Ａ、Ｒ^２２ＡとＲ^２３Ａ、及び、Ｒ^２３ＡとＲ^２４Ａは、それぞれ結合して、それぞれが結合する原子とともに環を形成していてもよい。
環Ｒ^１Ａは、窒素原子、Ｅ^１、Ｅ^１１Ａ、Ｅ^１２Ａ及びＥ^１３Ａで構成されるトリアゾール環又はジアゾール環を表す。
環Ｒ^２Ａは、２つの炭素原子、Ｅ^２１Ａ、Ｅ^２２Ａ、Ｅ^２３Ａ及びＥ^２４Ａで構成されるベンゼン環、ピリジン環又はピリミジン環を表す。］
［１３］前記燐光発光性化合物が、式（１−Ａ１）で表される化合物、式（１−Ａ２）で表される化合物、式（１−Ａ３）で表される化合物又は式（１−Ａ４）で表される化合物である、［１２］に記載の燐光発光性化合物。

［式中、Ｍ^１、ｎ^１、ｎ^２、Ｒ^１１Ａ、Ｒ^１２Ａ、Ｒ^１３Ａ、Ｒ^２１Ａ、Ｒ^２２Ａ、Ｒ^２３Ａ、Ｒ^２４Ａ及びＡ^１−Ｇ^１−Ａ^２は、前記と同じ意味を表す。］
［１４］前記燐光発光性化合物が、式（１−Ａ３）で表される化合物であり、
前記Ｒ^１１Ａが、置換基を有していてもよいアリール基である、［１３］に記載の燐光発光性化合物。
［１５］前記不純物として含まれる塩素原子の量が、０．９質量ｐｐｍ以下である、［１１］〜［１４］のいずれかに記載の燐光発光性化合物。
［１６］前記不純物として含まれる塩素原子の量が、０．０１質量ｐｐｍ以上１２質量ｐｐｍ以下である、［１１］〜［１４］のいずれかに記載の燐光発光性化合物。
［１７］前記不純物として含まれる塩素原子の量が、０．１質量ｐｐｍ以上０．９質量ｐｐｍ以下である、［１５］又は［１６］に記載の燐光発光性化合物。
［１８］［１］〜［１０］のいずれかに記載の組成物を含む有機層を備える、発光素子。
［１９］［１１］〜［１７］のいずれかに記載の燐光発光性化合物が配合された有機層を備える、発光素子。[1] A composition in which a phosphorescent compound represented by the formula (1) and a host material are blended,
The composition whose quantity of the chlorine atom contained as an impurity in the said phosphorescent compound is 3.5 mass ppm or less with respect to solid content whole quantity mix | blended with the said composition.

[In the formula,
M ¹ represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom.
n ¹ represents an integer of 1 or more, n ² represents an integer of 0 or more, and n ¹ + n ² is 2 or 3. When M ¹ is a rhodium atom or an iridium atom, n ¹ + n ² is 3, and when M ¹ is a palladium atom or a platinum atom, n ¹ + n ² is 2.
E ¹ and E ² each independently represent a carbon atom or a nitrogen atom. However, at least one of E ¹ and E ² is a carbon atom.
The ring R ¹ represents a 5-membered aromatic heterocyclic ring, which may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When two or more rings R ¹ exist, they may be the same or different.
The ring R ² represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When a plurality of rings R ² exist, they may be the same or different.
The substituent which ring R ¹ may have and the substituent which ring R ² may have may be bonded to each other to form a ring together with the atoms to which they are attached.
A ¹ -G ¹ -A ² represents an anionic bidentate ligand. Each of A ¹ and A ² independently represents a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be atoms constituting a ring. G ¹ represents a single bond or an atomic group constituting a bidentate ligand with A ¹ and A ² . When ^two or more A ¹ -G ¹ -A ² are present, they may be the same or different. ]
[2] The total amount of chlorine atoms contained as impurities in the phosphorescent compound and chlorine atoms contained as impurities in the host material is 3.5 mass ppm or less based on the total amount of solids contained in the composition The composition according to [1], which is
[3] The composition according to [2], wherein the total amount of chlorine atoms is 0.8 mass ppm or less with respect to the total amount of solid content blended in the composition.
[4] The composition according to [2], wherein the total amount of chlorine atoms is 0.01 mass ppm or more and 3.0 mass ppm or less with respect to the total amount of solid content blended in the composition.
[5] In any one of [2] to [4], the total amount of the chlorine atoms is 0.1 mass ppm or more and 0.8 mass ppm or less with respect to the total amount of solid content mixed in the composition. Composition as described.
[6] The composition according to any one of [1] to [5], wherein the phosphorescent compound is a compound represented by the formula (1-A).

[In the formula,
M ¹ , n ¹ , n ² , E ¹ and A ¹ -G ¹ -A ² have the same meanings as described above.
E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A each independently represent a nitrogen atom or a carbon atom. When there are a plurality of E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A , they may be the same or different. When E ^11A is a nitrogen atom, R ^11A may be present or absent. When E ^12A is a nitrogen atom, R ^12A may be present or absent. When E ^13A is a nitrogen atom, R ^13A may be present or absent. When E ^21A is a nitrogen atom, R ^21A is absent. When E ^22A is a nitrogen atom, R ^22A is absent. When E ^23A is a nitrogen atom, R ^23A is absent. When E ^24A is a nitrogen atom, R ^24A is absent.
R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, It represents a monovalent heterocyclic group, a substituted amino group or a fluorine atom, and these groups may have a substituent. When a plurality of R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are present, they may be the same or different. R ^11A and R ^12A , R ^12A and R ^13A , R ^11A and R ^21A , R ^21A and R ^22A , R ^22A and R ^23A , and R ^23A and R ^24A are each bonded together with an atom to which each is bonded It may form a ring.
Ring R ^1A represents a triazole ring or a diazole ring composed of a nitrogen atom, E ¹ , E ^11A , E ^12A and E ^13A .
Ring R ^2A represents a benzene ring, a pyridine ring or a pyrimidine ring composed of two carbon atoms, E ^21A , E ^22A , E ^23A and E ^24A . ]
[7] The phosphorescent compound is a compound represented by the formula (1-A1), a compound represented by the formula (1-A2), a compound represented by the formula (1-A3) or a compound represented by the formula (1- The composition according to [6], which is a compound represented by A4).

[Wherein, M ¹ , n ¹ , n ² , R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A , R ^24A and A ¹ -G ¹ -A ² have the same meanings as described above] . ]
[8] The phosphorescent compound is a compound represented by formula (1-A3),
The composition according to [7], wherein R ^11A is an aryl group which may have a substituent.
[9] The composition according to any one of [1] to [8], wherein the host material is a compound represented by Formula (H-1).

[In the formula,
Ar ^H1 and Ar ^H2 each independently represent an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.
n ^H1 and n ^H2 each independently represent 0 or 1. When there are a plurality of n ^H1 , they may be the same or different. Plural n ^H2 may be the same or different.
n ^H3 represents an integer of 0 or more.
L ^H1 represents an arylene group, a divalent heterocyclic group, or a group represented ^by- [C (R ^H11 ) ₂ ] n ^H11- , and these groups may have a substituent. When two or more L ^H1 are present, they may be the same or different.
n ^H11 represents an integer of 1 or more and 10 or less. R ^H11 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. A plurality of R ^H11 may be the same or different, and may be bonded to each other to form a ring together with the carbon atoms to which they are bonded.
L ^H2 represents a group represented by -N (-L ^H21 -R ^H21 )-. When two or more L ^H2 are present, they may be the same or different.
L ^H21 represents a single bond, an arylene group or a divalent heterocyclic group, and these groups may have a substituent. R ^H21 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]
[10] [1] to [1], further containing at least one material selected from the group consisting of a hole transport material, a hole injection material, an electron transport material, an electron injection material, a light emitting material, an antioxidant and a solvent The composition in any one of 8].
[11] A phosphorescent compound represented by the formula (1), which is
The phosphorescent compound whose quantity of the chlorine atom contained as an impurity is 15 mass ppm or less with respect to the whole quantity of the said phosphorescent compound.

[In the formula,
M ¹ represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom.
n ¹ represents an integer of 1 or more, n ² represents an integer of 0 or more, and n ¹ + n ² is 2 or 3. When M ¹ is a rhodium atom or an iridium atom, n ¹ + n ² is 3, and when M ¹ is a palladium atom or a platinum atom, n ¹ + n ² is 2.
E ¹ and E ² each independently represent a carbon atom or a nitrogen atom. However, at least one of E ¹ and E ² is a carbon atom.
The ring R ¹ represents a 5-membered aromatic heterocyclic ring, which may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When two or more rings R ¹ exist, they may be the same or different.
The ring R ² represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When a plurality of rings R ² exist, they may be the same or different.
The substituent which ring R ¹ may have and the substituent which ring R ² may have may be bonded to each other to form a ring together with the atoms to which they are attached.
A ¹ -G ¹ -A ² represents an anionic bidentate ligand. Each of A ¹ and A ² independently represents a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be atoms constituting a ring. G ¹ represents a single bond or an atomic group constituting a bidentate ligand with A ¹ and A ² . When ^two or more A ¹ -G ¹ -A ² are present, they may be the same or different. ]
[12] The phosphorescent compound according to [11], wherein the phosphorescent compound represented by the formula (1) is a compound represented by the formula (1-A).

[In the formula,
M ¹ , n ¹ , n ² , E ¹ and A ¹ -G ¹ -A ² have the same meanings as described above.
E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A each independently represent a nitrogen atom or a carbon atom. When there are a plurality of E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A , they may be the same or different. When E ^11A is a nitrogen atom, R ^11A may be present or absent. When E ^12A is a nitrogen atom, R ^12A may be present or absent. When E ^13A is a nitrogen atom, R ^13A may be present or absent. When E ^21A is a nitrogen atom, R ^21A is absent. When E ^22A is a nitrogen atom, R ^22A is absent. When E ^23A is a nitrogen atom, R ^23A is absent. When E ^24A is a nitrogen atom, R ^24A is absent.
R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, It represents a monovalent heterocyclic group, a substituted amino group or a fluorine atom, and these groups may have a substituent. When a plurality of R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are present, they may be the same or different. R ^11A and R ^12A , R ^12A and R ^13A , R ^11A and R ^21A , R ^21A and R ^22A , R ^22A and R ^23A , and R ^23A and R ^24A are each bonded together with an atom to which each is bonded It may form a ring.
Ring R ^1A represents a triazole ring or a diazole ring composed of a nitrogen atom, E ¹ , E ^11A , E ^12A and E ^13A .
Ring R ^2A represents a benzene ring, a pyridine ring or a pyrimidine ring composed of two carbon atoms, E ^21A , E ^22A , E ^23A and E ^24A . ]
[13] The phosphorescent compound is a compound represented by the formula (1-A1), a compound represented by the formula (1-A2), a compound represented by the formula (1-A3) or a compound represented by the formula (1- The phosphorescent compound according to [12], which is a compound represented by A4).

[Wherein, M ¹ , n ¹ , n ² , R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A , R ^24A and A ¹ -G ¹ -A ² have the same meanings as described above] . ]
[14] The phosphorescent compound is a compound represented by formula (1-A3),
The phosphorescent compound according to [13], wherein R ^11A is an aryl group which may have a substituent.
[15] The phosphorescent compound according to any one of [11] to [14], wherein the amount of chlorine atoms contained as the impurity is 0.9 mass ppm or less.
[16] The phosphorescent compound according to any one of [11] to [14], wherein the amount of chlorine atoms contained as the impurity is 0.01 mass ppm or more and 12 mass ppm or less.
[17] The phosphorescent compound according to [15] or [16], wherein the amount of chlorine atoms contained as the impurity is 0.1 mass ppm or more and 0.9 mass ppm or less.
[18] A light emitting device comprising an organic layer containing the composition according to any one of [1] to [10].
[19] A light emitting device comprising an organic layer in which the phosphorescent compound according to any one of [11] to [17] is blended.

  According to the present invention, it is possible to provide a composition and a phosphorescent compound which are useful for the production of a light emitting device in which initial deterioration is sufficiently suppressed. Further, according to the present invention, it is possible to provide a light emitting element in which initial deterioration is sufficiently suppressed.

  Hereinafter, preferred embodiments of the present invention will be described in detail.

<Description of common terms>
The terms commonly used in the present specification have the following meanings, unless otherwise specified.

  Me represents a methyl group, Et represents an ethyl group, Bu represents a butyl group, i-Pr represents an isopropyl group, and t-Bu represents a tert-butyl group.

  The hydrogen atom may be a deuterium atom or a light hydrogen atom.

  In the formulas representing a phosphorescent compound and a metal complex, a solid line representing a bond with a central metal means a covalent bond or a coordinate bond.

The "polymer compound" means a polymer having a molecular weight distribution and having a number average molecular weight in terms of polystyrene of 1 × 10 ³ to 1 × 10 ⁸ .

  The polymer compound may be any of a block copolymer, a random copolymer, an alternating copolymer, and a graft copolymer, or may be another embodiment.

  The end group of the polymer compound is preferably a stable group because the light emission characteristics or the luminance life may be reduced when the polymer compound is used for the preparation of a light emitting device if the polymerization active group remains as it is. It is. The terminal group is preferably a group conjugated with the main chain, and examples thereof include a group bonded to an aryl group or a monovalent heterocyclic group via a carbon-carbon bond.

The “low molecular weight compound” means a compound having no molecular weight distribution and having a molecular weight of 1 × 10 ⁴ or less.

  The "constituent unit" means a unit which is present one or more in the polymer compound.

The "alkyl group" may be linear or branched. The carbon atom number of the linear alkyl group is usually 1 to 50, preferably 3 to 30, and more preferably 4 to 20, not including the carbon atom number of the substituent. The carbon atom number of the branched alkyl group is usually 3 to 50, preferably 3 to 30, and more preferably 4 to 20, not including the carbon atom number of the substituent.
The alkyl group may have a substituent, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a 2-butyl group, an isobutyl group, a tert-butyl group, a pentyl group and an isoamyl group, 2-ethylbutyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, 3-propylheptyl group, decyl group, 3,7-dimethyloctyl group, 2-ethyloctyl group, 2-hexyldecyl group, dodecyl group And groups in which a hydrogen atom in these groups is substituted with a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a fluorine atom or the like, and examples thereof include a trifluoromethyl group, a pentafluoroethyl group and a perm. Fluorobutyl group, perfluorohexyl group, perfluorooctyl group, 3-phenylpropyl group, 3- 4-methylphenyl) propyl group, 3- (3,5-di - hexyl phenyl) propyl group, and 6-ethyloxy-hexyl group.
The carbon atom number of the "cycloalkyl group" is usually 3 to 50, preferably 3 to 30, and more preferably 4 to 20, not including the carbon atom number of the substituent.
The cycloalkyl group may have a substituent, and examples thereof include a cyclohexyl group, a cyclohexylmethyl group and a cyclohexylethyl group.

The “aryl group” means an atomic group remaining after removing one hydrogen atom directly bonded to a carbon atom constituting a ring from an aromatic hydrocarbon. The carbon atom number of the aryl group is usually 6 to 60, preferably 6 to 20, more preferably 6 to 10, not including the carbon atom number of the substituent.
The aryl group may have a substituent, and examples thereof include a phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthracenyl group, 2-anthracenyl group, 9-anthracenyl group, 1-pyrenyl group, 2 -Pyrenyl group, 4-pyrenyl group, 2-fluorenyl group, 3-fluorenyl group, 4-fluorenyl group, 2-phenylphenyl group, 3-phenylphenyl group, 4-phenylphenyl group, and hydrogen atom in these groups Are groups substituted with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, a fluorine atom or the like.

The "alkoxy group" may be linear or branched. The carbon atom number of the linear alkoxy group is usually 1 to 40, preferably 4 to 10, not including the carbon atom number of the substituent. The carbon atom number of the branched alkoxy group is usually 3 to 40, preferably 4 to 10, not including the carbon atom number of the substituent.
The alkoxy group may have a substituent, and examples thereof include methoxy group, ethoxy group, propyloxy group, isopropyloxy group, butyloxy group, isobutyloxy group, tert-butyloxy group, pentyloxy group, hexyloxy group, And heptyloxy group, octyloxy group, 2-ethylhexyloxy group, nonyloxy group, decyloxy group, 3,7-dimethyloctyloxy group, lauryloxy group, and a hydrogen atom in these groups is a cycloalkyl group, an alkoxy group, Examples thereof include groups substituted with a cycloalkoxy group, an aryl group, a fluorine atom and the like.
The carbon atom number of the "cycloalkoxy group" is usually 3 to 40, preferably 4 to 10, not including the carbon atom number of the substituent.
The cycloalkoxy group may have a substituent, and examples thereof include a cyclohexyloxy group.

The carbon atom number of the "aryloxy group" is usually 6 to 60, preferably 6 to 48, not including the carbon atom number of the substituent.
The aryloxy group may have a substituent, and examples thereof include phenoxy group, 1-naphthyloxy group, 2-naphthyloxy group, 1-anthracenyloxy group, 9-anthracenyloxy group, 1-type Pyrenyloxy groups and groups in which a hydrogen atom in these groups is substituted with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, a fluorine atom or the like can be mentioned.

The “p-valent heterocyclic group” (p represents an integer of 1 or more) means p out of hydrogen atoms directly bonded to a carbon atom or a hetero atom constituting a ring from the heterocyclic compound. Means the remaining atomic groups excluding the hydrogen atom of Among p-valent heterocyclic groups, carbon atoms constituting the ring or the remaining atomic groups obtained by removing p hydrogen atoms from hydrogen atoms directly bonded to a hetero atom from an aromatic heterocyclic compound "P-valent aromatic heterocyclic group" is preferred.
The “aromatic heterocyclic compound” is a complex such as oxadiazole, thiadiazole, thiazole, oxazole, thiophene, pyrrole, phosphole, furan, pyridine, pyrazine, pyrimidine, triazine, pyridazine, quinoline, isoquinoline, carbazole, dibenzophosphole etc. Compounds in which the ring itself exhibits aromaticity, and heterocycles such as phenoxazine, phenothiazine, dibenzoborole, dibenzosilole, benzopyran and the like themselves do not exhibit aromaticity, but an aromatic ring is fused to the heterocycle. It means a compound.

The carbon atom number of the monovalent heterocyclic group is usually 2 to 60, preferably 4 to 20, not including the carbon atom number of the substituent.
The monovalent heterocyclic group may have a substituent, and examples thereof include thienyl group, pyrrolyl group, furyl group, pyridinyl group, piperidinyl group, quinolinyl group, isoquinolinyl group, pyrimidinyl group, triazinyl group, and the like Groups in which a hydrogen atom in any of the groups is substituted with an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or the like.

  The "halogen atom" represents a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

The "amino group" may have a substituent and is preferably a substituted amino group. As a substituent which an amino group has, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group is preferable.
Examples of the substituted amino group include dialkylamino group, dicycloalkylamino group and diarylamino group.
Examples of the amino group include dimethylamino, diethylamino, diphenylamino, bis (4-methylphenyl) amino, bis (4-tert-butylphenyl) amino, bis (3,5-di-tert-) And butylphenyl) amino.

The "alkenyl group" may be linear or branched. The carbon atom number of the linear alkenyl group is usually 2 to 30, preferably 3 to 20, not including the carbon atom number of the substituent. The carbon atom number of the branched alkenyl group is usually 3 to 30, preferably 4 to 20, not including the carbon atom number of the substituent.
The carbon atom number of the "cycloalkenyl group" is usually 3 to 30, preferably 4 to 20, not including the carbon atom number of the substituent.
The alkenyl group and cycloalkenyl group may have a substituent, and examples thereof include a vinyl group, 1-propenyl group, 2-propenyl group, 2-butenyl group, 3-butenyl group, 3-pentenyl group, 4- Examples include pentenyl group, 1-hexenyl group, 5-hexenyl group, 7-octenyl group, and groups in which these groups have a substituent.

The "alkynyl group" may be linear or branched. The carbon atom number of the alkynyl group is 2-20 normally, without including the carbon atom of a substituent, Preferably it is 3-20. The carbon atom number of a branched alkynyl group is 4-30 normally, without including the carbon atom of a substituent, Preferably it is 4-20.
The carbon atom number of the "cycloalkynyl group" is usually 4 to 30, preferably 4 to 20, not including the carbon atom of the substituent.
The alkynyl group and the cycloalkynyl group may have a substituent, and examples thereof include ethynyl group, 1-propynyl group, 2-propynyl group, 2-butynyl group, 3-butynyl group, 3-pentynyl group, 4-pentynyl group A pentynyl group, 1-hexynyl group, 5-hexynyl group, and the group which these groups have a substituent are mentioned.

The "arylene group" means an atomic group remaining after removing two hydrogen atoms directly bonded to carbon atoms constituting a ring from an aromatic hydrocarbon. The carbon atom number of the arylene group is usually 6 to 60, preferably 6 to 30, and more preferably 6 to 18, not including the carbon atom number of the substituent.
The arylene group may have a substituent, and examples thereof include phenylene group, naphthalenediyl group, anthracenediyl group, phenanthrendiyl group, dihydrophenanthrendiyl group, naphthacene diyl group, fluorenediyl group, pyrene diyl group, perylene diyl group, A chrysendiyl group and a group in which these groups have a substituent are mentioned, and preferably a group represented by Formula (A-1) to Formula (A-20). The arylene group includes a group in which a plurality of these groups are bonded.

［式中、Ｒ及びＲ^ａは、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表す。複数存在するＲ及びＲ^ａは、各々、同一でも異なっていてもよく、Ｒ^ａ同士は互いに結合して、それぞれが結合する原子と共に環を形成していてもよい。］

[Wherein, R and R ^a each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group. Plural R and R ^a may be respectively the same or different, and R ^a may be bonded to each other to form a ring together with the atoms to which each is bonded. ]

The carbon atom number of the divalent heterocyclic group is usually 2 to 60, preferably 3 to 20, and more preferably 4 to 15, not including the carbon atom number of the substituent.
The divalent heterocyclic group may have a substituent, and examples thereof include pyridine, diazabenzene, triazine, azanaphthalene, diazanaphthalene, carbazole, dibenzofuran, dibenzothiophene, dibenzosilole, phenoxazine, phenothiazine, acridine, and the like. Preferred are dihydroacridines, furans, thiophenes, azoles, diazoles and triazoles, and divalent groups in which two hydrogen atoms of hydrogen atoms directly bonded to ring carbon atoms or hetero atoms are removed, preferably These are groups represented by Formula (AA-1)-Formula (AA-34). The divalent heterocyclic group includes a group in which a plurality of these groups are bonded.

［式中、Ｒ及びＲ^ａは、前記と同じ意味を表す。］

[Wherein, R and R ^a represent the same meaning as described above. ]

  The “crosslinking group” is a group capable of generating a new bond by being subjected to heat treatment, ultraviolet irradiation treatment, near ultraviolet irradiation treatment, visible light irradiation treatment, infrared irradiation treatment, radical reaction, etc. Preferably, they are crosslinking groups represented by formulas (XL-1) to (XL-17) of crosslinking group A group.

［式中、Ｒ^ＸＬは、メチレン基、酸素原子又は硫黄原子を表し、ｎ^ＸＬは、０〜５の整数を表す。Ｒ^ＸＬが複数存在する場合、それらは同一でも異なっていてもよく、ｎ^ＸＬが複数存在する場合、それらは同一でも異なっていてもよい。＊１は結合位置を表す。これらの架橋性基は置換基を有していてもよい。］(Crosslinking group A group)

[Wherein, R ^XL represents a methylene group, an oxygen atom or a sulfur atom, and n ^XL represents an integer of 0 to 5]. When two or more R ^XL exist, they may be the same or different, and when two or more n ^XL exist, they may be the same or different. * 1 represents a bonding position. These crosslinkable groups may have a substituent. ]

  The "substituent" means a fluorine atom, cyano group, alkyl group, cycloalkyl group, aryl group, monovalent heterocyclic group, alkoxy group, cycloalkoxy group, aryloxy group, amino group, substituted amino group, alkenyl group And a cycloalkenyl group, an alkynyl group or a cycloalkynyl group. The substituent may be a crosslinking group.

  The term "chlorine" means an element of atomic number 17. The "bromine" means an element of atomic number 35.

[Phosphorescent Compound Represented by Formula (1)]
First, the phosphorescent compound represented by Formula (1) mixed with the composition according to the present embodiment will be described.

  The phosphorescent compound represented by the formula (1) is usually a compound (metal complex) showing phosphorescence at room temperature (25 ° C.), preferably from the triplet excited state at room temperature (25 ° C.) It is a compound that emits light.

  The phosphorescent compound represented by the formula (1) is preferably a compound having a maximum peak wavelength of 380 nm or more and less than 495 nm, and more preferably, a maximum peak wavelength of 400 nm or more and less than 490 nm It is a compound, more preferably a compound whose maximum peak wavelength of emission spectrum is 420 nm or more and less than 485 nm, particularly preferably a compound whose maximum peak wavelength of emission spectrum is 440 nm or more and less than 480 nm, particularly preferably It is a compound whose maximum peak wavelength of the emission spectrum is 460 nm or more and less than 475 nm.

The maximum peak wavelength of the emission spectrum of the phosphorescent compound is prepared by dissolving the phosphorescent compound in an organic solvent such as xylene, toluene, chloroform, tetrahydrofuran or the like to prepare a dilute solution (1 × 10 ⁻⁶ to 1 × 10 ^{− 3} mass%), it can be evaluated by measuring the PL spectrum of the diluted solution at room temperature. As an organic solvent in which the phosphorescent compound is dissolved, xylene is preferable.

The phosphorescent compound represented by the formula (1) is defined by the central metal M ¹ , a ligand whose number is defined by the index n ¹ , and the number by the index n ² And a phosphorescent compound comprising the

M ¹ is preferably an iridium atom or a platinum atom, and more preferably an iridium atom, since the initial deterioration of the light emitting device according to the present embodiment is further suppressed.

When M ¹ is a rhodium atom or an iridium atom, n ¹ is preferably 2 or 3, and more preferably 3.

When M ¹ is a palladium atom or a platinum atom, n ¹ is preferably 2.

E ¹ and E ² are preferably carbon atoms.

The ring R ¹ is preferably a 5-membered aromatic heterocycle having 2 or more and 4 or less nitrogen atoms as a constituent atom, more preferably a diazole ring or a triazole ring, and being a diazole ring More preferably, these rings may have a substituent.

The ring R ² is preferably a 5- or 6-membered aromatic hydrocarbon ring or a 5- or 6-membered aromatic heterocycle, preferably a 6-membered aromatic hydrocarbon ring or a 6-membered aromatic heterocycle The ring is more preferably a ring, further preferably a six-membered aromatic hydrocarbon ring, and these rings may have a substituent. However, when ring R ² is a 6-membered aromatic heterocycle, E ² is a carbon atom.

Examples of the ring R ² include benzene ring, naphthalene ring, fluorene ring, phenanthrene ring, indene ring, pyridine ring, diazabenzene ring and triazine ring, and benzene ring, naphthalene ring, fluorene ring, pyridine ring or pyrimidine ring is Preferably, a benzene ring, a pyridine ring or a pyrimidine ring is more preferable, and a benzene ring is further preferable, and these rings may have a substituent.

As a substituent which ring R ¹ and ring R ² may have, a fluorine atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryloxy group, an aryl group, a monovalent heterocyclic group or A substituted amino group is preferred, an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group, a monovalent heterocyclic group or a substituted amino group is more preferred, and an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group is preferred. Further preferred is an aryl group, and these groups may further have a substituent.

The aryl group in the substituent which ring R ¹ and ring R ² may have is preferably a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a dihydrophenanthrenyl group, a fluorenyl group or a pyrenyl group, and phenyl is preferred. A group, a naphthyl group or a fluorenyl group is more preferable, a phenyl group is still more preferable, and these groups may have a substituent.

The monovalent heterocyclic group in the substituent which may be possessed by ring R ¹ and ring R ² is pyridyl group, pyrimidinyl group, triazinyl group, quinolinyl group, isoquinolinyl group, dibenzofuranyl group, dibenzothienyl group, Carbazolyl group, azacarbazolyl group, diazacarbazolyl group, phenoxazinyl group or phenothiazinyl group is preferable, pyridyl group, pyrimidinyl group, triazinyl group, carbazolyl group, azacarbazolyl group or diazacarbazolyl group is more preferable, pyridyl group, A pyrimidinyl group or a triazinyl group is more preferable, and these groups may have a substituent.

In the substituted amino group in the substituent which ring R ¹ and ring R ² may have, as a substituent which the amino group has, an aryl group or a monovalent heterocyclic group is preferable, and these groups are further a substituent May be included. The example and the preferable range of the aryl group in the substituent which an amino group has are the same as the example and the preferable range of the aryl group in the substituent which the ring R ¹ and the ring R ² may have. The example and the preferred range of the monovalent heterocyclic group in the substituent which the amino group has is the same as the example and the preferred range of the monovalent heterocyclic group in the substituent which the ring R ¹ and the ring R ² may have. It is.

Examples of the substituent which the substituent which the ring R ¹ and the ring R ² may have may further have include an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, cyclo An alkoxy group, an aryloxy group or a substituted amino group is preferable, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group is more preferable, and an alkyl group, a cycloalkyl group, an aryl group or a monovalent group is preferable. The heterocyclic group is more preferable, and the alkyl group, the cycloalkyl group or the aryl group is particularly preferable, and these groups may further have a substituent.

The aryl group, the monovalent heterocyclic group or the substituted amino group in the substituent that the ring R ¹ and the ring R ² may have is preferable because the initial deterioration of the light emitting device according to this embodiment is further suppressed. Is a group represented by the formula (D-A), (D-B) or (D-C), more preferably a group represented by the formula (D-A) or (D-C) And particularly preferably a group represented by the formula (D-C).

［式中、
ｍ^ＤＡ１、ｍ^ＤＡ２及びｍ^ＤＡ３は、それぞれ独立に、０以上の整数を表す。
Ｇ^ＤＡは、窒素原子、芳香族炭化水素基又は複素環基を表し、これらの基は置換基を有していてもよい。
Ａｒ^ＤＡ１、Ａｒ^ＤＡ２及びＡｒ^ＤＡ３は、それぞれ独立に、アリーレン基又は２価の複素環基を表し、これらの基は置換基を有していてもよい。Ａｒ^ＤＡ１、Ａｒ^ＤＡ２及びＡｒ^ＤＡ３が複数ある場合、それらはそれぞれ同一でも異なっていてもよい。
Ｔ^ＤＡは、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。複数あるＴ^ＤＡは、同一でも異なっていてもよい。］

[In the formula,
m ^DA1 , m ^DA2 and m ^DA3 each independently represent an integer of 0 or more.
G ^DA represents a nitrogen atom, an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.
Ar ^DA1 , Ar ^DA2 and Ar ^DA3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are a plurality of Ar ^DA1 , Ar ^DA2 and Ar ^DA3 , they may be the same or different.
T ^DA represents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. The plurality of ^TDAs may be the same or different. ]

［式中、
ｍ^ＤＡ１、ｍ^ＤＡ２、ｍ^ＤＡ３、ｍ^ＤＡ４、ｍ^ＤＡ５、ｍ^ＤＡ６及びｍ^ＤＡ７は、それぞれ独立に、０以上の整数を表す。
Ｇ^ＤＡは、窒素原子、芳香族炭化水素基又は複素環基を表し、これらの基は置換基を有していてもよい。複数あるＧ^ＤＡは、同一でも異なっていてもよい。
Ａｒ^ＤＡ１、Ａｒ^ＤＡ２、Ａｒ^ＤＡ３、Ａｒ^ＤＡ４、Ａｒ^ＤＡ５、Ａｒ^ＤＡ６及びＡｒ^ＤＡ７は、それぞれ独立に、アリーレン基又は２価の複素環基を表し、これらの基は置換基を有していてもよい。Ａｒ^ＤＡ１、Ａｒ^ＤＡ２、Ａｒ^ＤＡ３、Ａｒ^ＤＡ４、Ａｒ^ＤＡ５、Ａｒ^ＤＡ６及びＡｒ^ＤＡ７が複数ある場合、それらはそれぞれ同一でも異なっていてもよい。
Ｔ^ＤＡは、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。複数あるＴ^ＤＡは、同一でも異なっていてもよい。］

[In the formula,
m ^DA1 , m ^DA2 , m ^DA3 , m ^DA4 , m ^DA5 , m ^DA6 and m ^DA7 each independently represent an integer of 0 or more.
G ^DA represents a nitrogen atom, an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent. A plurality of G ^DAs may be the same or different.
Ar ^DA1 , Ar ^DA2 , Ar ^DA3 , Ar ^DA4 , Ar ^DA5 , Ar ^DA6 and Ar ^DA7 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent Good. When there are a plurality of Ar ^DA1 , Ar ^DA2 , Ar ^DA3 , Ar ^DA4 , Ar ^DA5 , Ar ^DA6 and Ar ^DA7 , they may be the same or different.
T ^DA represents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. The plurality of ^TDAs may be the same or different. ]

［式中、
ｍ^ＤＡ１は、０以上の整数を表す。
Ａｒ^ＤＡ１は、アリーレン基又は２価の複素環基を表し、これらの基は置換基を有していてもよい。Ａｒ^ＤＡ１が複数ある場合、それらは同一でも異なっていてもよい。
Ｔ^ＤＡは、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。］

[In the formula,
m ^DA1 represents an integer of 0 or more.
Ar ^DA1 represents an arylene group or a divalent heterocyclic group, and these groups may have a substituent. When there are a plurality of Ar ^DA1 , they may be the same or different.
T ^DA represents an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]

m ^DA1 , m ^DA2 , m ^DA3 , m ^DA4 , m ^DA5 , m ^DA6 and m ^DA7 are usually integers of 10 or less, preferably 5 or less, more preferably 2 or less, further Preferably it is 0 or 1. m ^DA2 , m ^DA3 , m ^DA4 , m ^DA5 , m ^DA6 and m ^DA7 are preferably the same integer, and m ^DA1 , m ^DA2 , m ^DA3 , m ^DA4 , m ^DA5 , m ^DA6 and m ^DA7 are More preferably, they are the same integer.

G ^DA is preferably a group represented by the formulas (GDA-11) to (GDA-15), more preferably a group represented by the formulas (GDA-11) to (GDA-14), further Preferred is a group represented by the formula (GDA-11) or (GDA-14), and particularly preferred is a group represented by the formula (GDA-11).

［式中、
＊は、式（Ｄ−Ａ）におけるＡｒ^ＤＡ１、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ１、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ２、又は、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ３との結合を表す。
＊＊は、式（Ｄ−Ａ）におけるＡｒ^ＤＡ２、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ２、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ４、又は、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ６との結合を表す。
＊＊＊は、式（Ｄ−Ａ）におけるＡｒ^ＤＡ３、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ３、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ５、又は、式（Ｄ−Ｂ）におけるＡｒ^ＤＡ７との結合を表す。
Ｒ^ＤＡは、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基又は１価の複素環基を表し、これらの基は更に置換基を有していてもよい。Ｒ^ＤＡが複数ある場合、それらは同一でも異なっていてもよい。］

[In the formula,
* Represents a bond to Ar ^DA1 in formula (D-A), Ar ^DA1 in formula (D-B), Ar ^DA2 in formula (D-B), or Ar ^DA3 in formula (D-B).
** represents a bond to Ar ^DA2 in formula (D-A), Ar ^DA2 in formula (D-B), Ar ^DA4 in formula (D-B), or Ar ^DA6 in formula (D-B) .
*** is, ^{Ar DA3} in the formula (D-A), ^{Ar DA3} in the formula (D-B), ^{Ar DA5} in the formula (D-B), or, the bond between ^{Ar DA7} in the formula (D-B) Represent.
R ^DA represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may further have a substituent. When there are a plurality of ^RDAs , they may be the same or different. ]

R ^DA is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group or a cycloalkoxy group, more preferably a hydrogen atom, an alkyl group or a cycloalkyl group, and these groups have a substituent May be

Ar ^DA1 , Ar ^DA2 , Ar ^DA3 , Ar ^DA4 , Ar ^DA5 , Ar ^DA6 and Ar ^DA7 are preferably a phenylene group, a ^fluorenedyl group or a carbazole diyl group, and more preferably a group represented by the formula (A-1) A-3), (A-8), (A-9), (AA-10), (AA-11), (AA-33) or (AA-34), more preferably a group Is a group represented by the formulas (ArDA-1) to (ArDA-5), particularly preferably a group represented by the formula (ArDA-1) to the formula (ArDA-3), and particularly preferably a group It is a group represented by ArDA-1).

［式中、
Ｒ^ＤＡは前記と同じ意味を表す。
Ｒ^ＤＢは、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。Ｒ^ＤＢが複数ある場合、それらは同一でも異なっていてもよい。］

[In the formula,
R ^DA has the same meaning as described above.
R ^DB represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. When there are multiple R ^DBs , they may be the same or different. ]

R ^DB is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group or a monovalent heterocyclic group, still more preferably an aryl group, The group may have a substituent.

T ^DA is preferably a group represented by formulas (TDA-1) to (TDA-3), and more preferably a group represented by formula (TDA-1).

［式中、Ｒ^ＤＡ及びＲ^ＤＢは、前記と同じ意味を表す。］

[Wherein, R ^DA and R ^DB represent the same meaning as described above. ]

  The group represented by the formula (D-A) is preferably a group represented by the formulas (D-A1) to (D-A4), and more preferably the formula (D-A1) or (D-A4) Is a group represented by

［式中、
Ｒ^ｐ１、Ｒ^ｐ２、Ｒ^ｐ３及びＲ^ｐ４は、それぞれ独立に、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基又はフッ素原子を表す。Ｒ^ｐ１、Ｒ^ｐ２及びＲ^ｐ４が複数ある場合、それらはそれぞれ同一であっても異なっていてもよい。
ｎｐ１は、０〜５の整数を表し、ｎｐ２は０〜３の整数を表し、ｎｐ３は０又は１を表し、ｎｐ４は０〜４の整数を表す。複数あるｎｐ１は、同一でも異なっていてもよい。］

[In the formula,
R ^p1 , R ^p2 , R ^p3 and R ^p4 each independently represent an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a fluorine atom. When there are a plurality of R ^p1 , R ^p2 and R ^p4 , they may be the same or different.
np1 represents an integer of 0 to 5, np2 represents an integer of 0 to 3, np3 represents 0 or 1, and np4 represents an integer of 0 to 4. The plurality of np1 may be the same or different. ]

  The group represented by Formula (D-B) is preferably a group represented by Formula (D-B1) to (D-B3), and more preferably a group represented by Formula (D-B1) is there.

［式中、
Ｒ^ｐ１、Ｒ^ｐ２及びＲ^ｐ３は、それぞれ独立に、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基又はフッ素原子を表す。Ｒ^ｐ１及びＲ^ｐ２が複数ある場合、それらはそれぞれ同一でも異なっていてもよい。
ｎｐ１は０〜５の整数を表し、ｎｐ２は０〜３の整数を表し、ｎｐ３は０又は１を表す。ｎｐ１及びｎｐ２が複数ある場合、それらはそれぞれ同一でも異なっていてもよい。］

[In the formula,
R ^p1 , R ^p2 and R ^p3 each independently represent an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a fluorine atom. When there are a plurality of R ^p1 and R ^p2 , they may be the same or different.
np1 represents an integer of 0 to 5, np2 represents an integer of 0 to 3, and np3 represents 0 or 1. When there are a plurality of np1 and np2, they may be the same or different. ]

  The group represented by Formula (D-C) is preferably a group represented by Formula (D-C1) to (D-C4), and more preferably Formulas (D-C1) to (D-C3) And more preferably a group represented by the formula (D-C1) or (D-C2), and particularly preferably a group represented by the formula (D-C2).

［式中、
Ｒ^ｐ４、Ｒ^ｐ５及びＲ^ｐ６は、それぞれ独立に、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基又はフッ素原子を表す。Ｒ^ｐ４、Ｒ^ｐ５及びＲ^ｐ６が複数ある場合、それらはそれぞれ同一であっても異なっていてもよい。
ｎｐ４は、０〜４の整数を表し、ｎｐ５は０〜５の整数を表し、ｎｐ６は０〜５の整数を表す。］

[In the formula,
R ^p4 , R ^p5 and R ^p6 each independently represent an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a fluorine atom. When there are a plurality of R ^p4 , R ^p5 and R ^p6 , they may be the same or different.
np4 represents an integer of 0 to 4, np5 represents an integer of 0 to 5, and np6 represents an integer of 0 to 5. ]

  np1 is preferably 0 or 1, more preferably 1. np2 is preferably 0 or 1, more preferably 0. np3 is preferably 0. np4 is preferably an integer of 0-2. np5 is preferably an integer of 1 to 3. np6 is preferably an integer of 0-2.

R ^p1 , R ^p2 , R ^p3 , R ^p4 , R ^p5 and R ^p6 are preferably an alkyl group or a cycloalkyl group, more preferably a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, a hexyl group, 2-ethylhexyl group, cyclohexyl group, methoxy group, 2-ethylhexyloxy group, tert-octyl group or cyclohexyloxy group, more preferably methyl group, ethyl group, isopropyl group, tert-butyl group, hexyl group, 2 -Ethylhexyl group or tert-octyl group.

  As a group represented by Formula (DA), the group represented by Formula (DA-1)-(DA-12) is mentioned, for example.

［式中、Ｒ^Ｄは、メチル基、エチル基、イソプロピル基、ｔｅｒｔ−ブチル基、ヘキシル基、２−エチルヘキシル基、ｔｅｒｔ−オクチル基、シクロヘキシル基、メトキシ基、２−エチルヘキシルオキシ基又はシクロへキシルオキシ基を表す。Ｒ^Ｄが複数存在する場合、それらは同一でも異なっていてもよい。］

[Wherein, R ^D represents a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, a hexyl group, a 2-ethylhexyl group, a tert-octyl group, a cyclohexyl group, a methoxy group, a 2-ethylhexyloxy group or a cyclohexyloxy group Represents a group. If R ^D is plurally present, they may be the same or different. ]

  As group represented by Formula (D-B), group represented by Formula (D-B-1)-(D-B-4) is mentioned, for example.

［式中、Ｒ^Ｄは前記と同じ意味を表す。］

[Wherein, R ^D represents the same meaning as described above. ]

  As group represented by Formula (DC), group represented by Formula (DC-1)-(DC-17) is mentioned, for example.

［式中、Ｒ^Ｄは前記と同じ意味を表す。］

[Wherein, R ^D represents the same meaning as described above. ]

R ^D is preferably a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, a hexyl group, a 2-ethylhexyl group or a tert-octyl group.

Since the initial deterioration of the light emitting device according to this embodiment is further suppressed, at least one ring selected from the group consisting of rings R ¹ and ring R ² is, preferably has a substituent, the ring R ¹ is a substituted It is more preferable to have a group.

As a substituent which at least one ring selected from the group consisting of ring R ¹ and ring R ² has, preferably, an aryl group which may have a substituent or a monovalent which may have a substituent Of the formula (D-A1), (D-A4), (D-B1) or (D-). It is a group represented by C1) to (D-C4), particularly preferably a group represented by the formulas (D-C1) to (D-C3), particularly preferably the formula (D-C2) Is a group represented by

[Anionic bidentate ligand]
Examples of the anionic bidentate ligand represented by A ¹ -G ¹ -A ² include a ligand represented by the following formula.

［式中、＊は、Ｍ^１と結合する部位を示す。］

[Wherein, * represents a site that binds to M ¹ . ]

The anionic bidentate ligand represented by A ¹ -G ¹ -A ² may be a ligand represented by the following formula.

［式中、
＊は、Ｍ^１と結合する部位を表す。
Ｒ^Ｌ１は、水素原子、アルキル基、シクロアルキル基、アリール基、１価の複素環基又はフッ素原子を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｌ１は、同一でも異なっていてもよい。］

[In the formula,
* Represents a site that binds to M ¹ .
R ^L1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a fluorine atom, and these groups may have a substituent. Plural R ^L1 may be the same or different. ]

  The phosphorescent compound represented by Formula (1) is preferably a compound represented by Formula (1-A) because the initial deterioration of the light emitting device according to the present embodiment is further suppressed.

[Compound represented by Formula (1-A)]
When ring R ^1A is a diazole ring, an imidazole ring in which E ^11A is a nitrogen atom or an imidazole ring in which E ^12A is a nitrogen atom is preferable, and an imidazole ring in which E ^11A is a nitrogen atom is more preferable.

When ring R ^1A is a triazole ring, a triazole ring in which E ^11A and E ^12A is a nitrogen atom or a triazole ring in which E ^11A and E ^13A are a nitrogen atom is preferable, and E ^11A and E ^12A are a nitrogen atom More preferred is a triazole ring.

The ring R ^1A is preferably a diazole ring.

Examples and preferred ranges of the aryl group, monovalent heterocyclic group and substituted amino group in R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are respectively ring R ¹ and ring R ² Are the same as the examples and the preferred ranges of the aryl group, the monovalent heterocyclic group and the substituted amino group in the substituent which may be possessed.

Examples and preferred ranges of the substituent which may be possessed by R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A may be possessed by ring R ¹ and ring R ² Examples and preferred ranges of the substituent which the substituent may further have are the same.

When E ^11A is a nitrogen atom and R ^11A is present, R ^11A is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, preferably an aryl group or a monovalent heterocyclic ring. It is more preferably a group, still more preferably an aryl group, represented by formulas (D-A1), (D-A4), (D-B1) or (D-C1) to (D-C4). Groups are particularly preferred, and groups represented by formulas (D-C1) to (D-C3) are particularly preferred, and groups represented by formula (D-C2) are especially preferred. Preferably, these groups may have a substituent.

When E ^11A is a carbon atom, R ^11A is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, and a hydrogen atom, an alkyl group, a cycloalkyl group Or an aryl group is more preferable, a hydrogen atom, an alkyl group or a cycloalkyl group is more preferable, a hydrogen atom is particularly preferable, and these groups may have a substituent.

When E ^12A is a nitrogen atom and R ^12A is present, R ^12A is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, preferably an aryl group or a monovalent heterocyclic ring. It is more preferably a group, still more preferably an aryl group, represented by formulas (D-A1), (D-A4), (D-B1) or (D-C1) to (D-C4). Groups are particularly preferred, and groups represented by formulas (D-C1) to (D-C3) are particularly preferred, and groups represented by formula (D-C2) are especially preferred. Preferably, these groups may have a substituent.

When E ^12A is a carbon atom, R ^12A is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, and a hydrogen atom, an alkyl group, a cycloalkyl group Or an aryl group is more preferable, a hydrogen atom, an alkyl group or a cycloalkyl group is more preferable, a hydrogen atom is particularly preferable, and these groups may have a substituent.

When E ^13A is a nitrogen atom and R ^13A is present, R ^13A is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and is an aryl group or a monovalent heterocyclic ring. It is more preferably a group, still more preferably an aryl group, represented by formulas (D-A1), (D-A4), (D-B1) or (D-C1) to (D-C4). Groups are particularly preferred, and groups represented by formulas (D-C1) to (D-C3) are particularly preferred, and groups represented by formula (D-C2) are especially preferred. Preferably, these groups may have a substituent.

When E ^13A is a carbon atom, R ^13A is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, and a hydrogen atom, an alkyl group, a cycloalkyl group Or an aryl group is more preferable, a hydrogen atom, an alkyl group or a cycloalkyl group is more preferable, a hydrogen atom is particularly preferable, and these groups may have a substituent.

When ring R ^2A is a pyridine ring, a pyridine ring in which E ^21A is a nitrogen atom, a pyridine ring in which E ^22A is a nitrogen atom, or a pyridine ring in which E ^23A is a nitrogen atom is preferable, and E ^22A is a nitrogen atom Certain pyridine rings are more preferred.

When ring R ^2A is a pyrimidine ring, a pyrimidine ring in which E ^21A and E ^23A is a nitrogen atom, or a pyrimidine ring in which E ^22A and E ^24A are a nitrogen atom is preferable, and E ^22A and E ^24A are a nitrogen atom The pyrimidine ring is more preferred.

The ring R ^2A is preferably a benzene ring.

R ^21A , R ^22A , R ^23A and R ^24A may be a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, a fluorine atom, an aryl group, a monovalent heterocyclic group or a substituted amino group More preferably, it is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferably a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group. Particularly preferably a hydrogen atom, an alkyl group or a cycloalkyl group, particularly preferably a hydrogen atom, and these groups may have a substituent.

At least one selected from the group consisting of R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A is a substituent because the initial deterioration of the light emitting device according to this embodiment is further suppressed. It is preferably an aryl group which may have a substituent or a monovalent heterocyclic group which may have a substituent, more preferably an aryl group which may have a substituent, The group represented by (D-A1), (D-A4), (D-B1) or (D-C1) to (D-C4) is more preferably, and the formulas (D-C1) to (D) A group represented by -C3) is particularly preferable, and a group represented by the formula (D-C2) is particularly preferable.

At least one member selected from the group consisting of R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A may have an aryl group which may have a substituent or a substituent When it is a preferable monovalent heterocyclic group, at least one selected from the group consisting of R ^11A , R ^12A and R ^13A may have an aryl group which may have a substituent or a substituent 1 It is preferable that it is a divalent heterocyclic group, and it is more preferable that R ^11A or R ^12A is an aryl group which may have a substituent or a monovalent heterocyclic group which may have a substituent. More preferably, R ^11A is an aryl group which may have a substituent or a monovalent heterocyclic group which may have a substituent.

R ^11A and R ^12A , R ^12A and R ^13A , R ^11A and R ^21A , R ^21A and R ^22A , R ^22A and R ^23A , and R ^23A and R ^24A are each bonded together with an atom to which each is bonded The ring may be formed, but since the maximum peak wavelength of the emission spectrum of the phosphorescent compound represented by the formula (1) is a short wavelength, R ^11A and R ^12A and R ^12A and R ^13A are And preferably do not form a ring. Moreover, since the synthesis of the phosphorescent compound represented by the formula (1) is facilitated, R ^11A and R ^12A , R ^12A and R ^13A , R ^21A and R ^22A , R ^22A and R ^23A , and R ^23A And R ^24A preferably do not form a ring, R ^11A and R ^12A , R ^12A and R ^13A , R ^11A and R ^21A , R ^21A and R ^22A , R ^22A and R ^23A , and R ^23A and R ^24A More preferably, does not form a ring.

  The compound represented by the formula (1-A) further suppresses the initial deterioration of the light emitting device according to the present embodiment, and therefore, the compound represented by the formula (1-A1) and the compound represented by the formula (1-A2) Preferred is a compound represented by the formula (1-A3) or a compound represented by the formula (1-A4), and a compound represented by the formula (1-A1) or the formula (1-A3) It is more preferable that it is a compound represented by these, and it is still more preferable that it is a compound represented by Formula (1-A3).

  As a compound represented by Formula (1-A1), the compound represented by Formula (1-A1-1)-(1-A1-11) shown in Table 1 is mentioned, for example, Preferably it is Formula (1) It is a compound represented by -A1-1)-(1-A1-9), More preferably, it is a compound represented by Formula (1-A1-1)-(1-A1-7).

  Examples of the compound represented by the formula (1-A2) include compounds represented by the formulas (1-A2-1) to (1-A2-8) shown in Table 2, and preferably a compound represented by the formula (1) It is a compound represented by -A2-1)-(1-A2-6), More preferably, it is a compound represented by Formula (1-A2-1)-(1-A2-4).

  Examples of the compound represented by the formula (1-A3) include compounds represented by the formulas (1-A3-1) to (1-A3-11) shown in Table 3, and preferably a compound represented by the formula (1) It is a compound represented by -A3-1)-(1-A3-9), More preferably, it is a compound represented by Formula (1-A3-1)-(1-A3-8).

  Examples of the compound represented by the formula (1-A4) include compounds represented by the formulas (1-A4-1) to (1-A4-8) shown in Table 4, and preferably a compound represented by the formula (1) It is a compound represented by -A4-1)-(1-A4-6), More preferably, it is a compound represented by Formula (1-A4-1)-(1-A4-5).

  Examples of the compound represented by Formula (1) include Formulas (1-A1-1) to (1-A1-11), Formulas (1-A2-1) to (1-A2-8), and 1-A3-1) to (1-A3-11), formulas (1-A4-1) to (1-A4-8) and the following formulas (1-A-1) to (1-A-5) The compound to be represented is mentioned, Preferably Formula (1-A1-1)-(1-A1-9), Formula (1-A2-1)-(1-A2-6), Formula (1-A3-) 1) to (1-A3-9), the compounds represented by the formulas (1-A4-1) to (1-A4-6), or the formulas (1-A-1) to (1-A-5) Formulas (1-A1-1) to (1-A1-7), formulas (1-A2-1) to (1-A2-4), and formulas (1-A3-1) to (1) are more preferable. -A3-8), Formula (1-A4-1) to (1-A4-5) or Formula (1-A-3) It is a compound represented by-(1-A-5), More preferably, Formula (1-A1-1)-(1-A1-7) or Formula (1-A3-1)-(1-A3) -8), and particularly preferably compounds represented by the formulas (1-A3-1) to (1-A3-8).

[Method for Obtaining Phosphorescent Compound Represented by Formula (1)]
The phosphorescent compound represented by formula (1) is commercially available from Aldrich, Luminescence Technology Corp. , American Dye Source, etc.
Moreover, as a method of obtaining other than the above, WO2006 / 121811, WO2007 / 097153, JP2013-048190A, WO2004 / 101707, JP2013-147449A, and the like are particularly useful. It can obtain by manufacturing by the well-known method as described in literature, such as opening 2013-147450, Unexamined-Japanese-Patent No. 2013-147551 grade | etc.,.

[Amount of Chlorine Atom Contained in Phosphorescent Compound Represented by Formula (1) (C ¹ )]
In the composition according to the present embodiment, the amount (C ¹ ) of chlorine atoms contained as an impurity in the phosphorescent compound represented by the formula ( ¹ ) is usually 15 mass% with respect to the total amount of the phosphorescent compound. It is less than ppm. In the phosphorescent compound according to the present embodiment, the amount of chlorine atoms contained as impurities is preferably 13 mass ppm or less, and more preferably 9 because the initial deterioration of the light emitting device according to the present embodiment is suppressed. It is at most ppm by mass, more preferably at most 5 ppm by mass, particularly preferably at most 1 ppm by mass, particularly preferably at most 0.9 ppm by mass, particularly preferably at most 0 ppm by mass.

  Further, in the phosphorescent compound according to the present embodiment, the amount of chlorine atoms contained as an impurity is preferably 0.01 mass ppm or more and 12 mass ppm or less because the luminous efficiency of the light emitting device according to the present embodiment is excellent. More preferably, it is 0.05 mass ppm or more and 11 mass ppm or less, more preferably 0.1 mass ppm or more and 10 mass ppm or less, and particularly preferably 0.5 mass ppm or more and 9 mass ppm or less. Particularly preferably, it is 0.9 mass ppm or more and 9 mass ppm or less.

  Further, in the phosphorescent compound according to the present embodiment, the amount of chlorine atoms contained as an impurity suppresses the initial deterioration of the light emitting element according to the present embodiment, and the light emission efficiency of the light emitting element according to the present embodiment Because it is excellent, it is preferably 0.01 mass ppm or more and 5 mass ppm or less, more preferably 0.05 mass ppm or more and 1 mass ppm or less, and still more preferably 0.1 mass ppm or more and 0.9 mass ppm or less is there.

  In the present specification, the "amount of chlorine atom" can be measured by an automatic combustion-ion chromatography method. That is, "the amount of chlorine atoms" means the mass concentration of chlorine when measured by an automatic combustion-ion chromatography method. Moreover, "the amount of chlorine atoms" means "0 mass ppm" that the mass concentration of chlorine is below the detection limit when it measures by an automatic combustion-ion chromatography method.

The specific method for calculating the C ¹ by way of examples D1 and Example D2 described later, will be described.

First, in Example D1, the amount of chlorine atoms of the phosphorescent compound MC3 measured by auto combustion-ion chromatography is equal to or less than the detection limit, and thus C ¹ is 0 mass ppm.

  Next, in Example D2, the amounts of chlorine atoms of the phosphorescent compound MC3 and the phosphorescent compound MC2 measured by auto combustion-ion chromatography were respectively less than or equal to the detection limit (ie, 0 mass ppm) and 9 It is mass ppm. The mass ratio of the phosphorescent compound MC3 to the phosphorescent compound MC2 is phosphorescent compound MC3: phosphorescent compound MC2 = 22.5: 2.5.

Therefore, C ¹ can be determined from the amount of chlorine atoms contained in each phosphorescent compound and the amount of preparation thereof, and can be determined as follows.
C ¹ = {0 × 22.5 / (22.5 + 2.5)} + {9 × 2.5 / (22.5 + 2.5)} = 0.9 mass ppm

In the same manner as the specific calculation method of C ¹ in the above-mentioned Example D2, C ¹ in Example D 3 is determined as follows.
C ¹ = {0 × 12.5 / (12.5 + 12.5)} + {9 × 12.5 / (12.5 + 12.5)} = 4.5 mass ppm

In the same manner as the specific calculation method of C ¹ in the above-mentioned Example D1, C ¹ in Example D 4 is 9 mass ppm.

In the same manner as the specific calculation method of C ¹ in the above-mentioned Example D2, C ¹ in Example D 5 is determined as follows.
C ¹ = {9 × 12.5 / (12.5 + 12.5)} + {16 × 12.5 / (12.5 + 12.5)} = 12.5 mass ppm

In the same manner as the specific calculation method of C ¹ in the above-mentioned Example D1, C ¹ in Comparative Example CD ¹ is 16 mass ppm.

[How to reduce C ¹ ]
Examples of the method of reducing C ¹ include at least one method selected from purification and treatment with a dehalogenating agent.

[Purification]
As purification, the 4th edition experimental chemistry course (1993, Maruzen), 5th edition experimental chemistry course (2007, Maruzen), new experimental chemistry course (1975, Maruzen), organic chemistry experiment ticking (1988) , Chemical Dojin, etc.).

  Purification includes sublimation, extraction, reprecipitation, recrystallization, chromatography, or adsorption.

  When purification is carried out twice or more times, those methods may be the same or different.

In the sublimation, the degree of vacuum and the sublimation temperature may be appropriately set in accordance with the material to be sublimed. The degree of vacuum is preferably 1 × 10 ⁻¹⁰ to 1 × 10 ⁵ Pa, more preferably 1 × 10 ⁻⁷ to 1 × 10 ² Pa, still more preferably 1 × 10 ^{−5 to} 1 Pa, Particularly preferably, it is 1 × 10 ⁻⁴ to 1 × 10 ⁻² Pa. The sublimation temperature is preferably −100 ° C. to 1000 ° C., more preferably 0 ° C. to 700 ° C., still more preferably 100 ° C. to 500 ° C., and particularly preferably 200 ° C. to 350 ° C.

  The extraction is preferably separation or solid-liquid extraction using a Soxhlet extractor, and more preferably separation.

  The example of the solvent used for extraction is the same as the example of the solvent used for reaction in the process by the below-mentioned dehalogenating agent.

  The chromatography is preferably column chromatography.

  As a filler used for column chromatography, silica gel or alumina is preferable.

  Examples of the solvent used for chromatography are the same as the examples of the solvent used for the reaction in the treatment with the dehalogenating agent described later.

  Examples of the solvent used for reprecipitation are the same as the examples of the solvent used for the reaction in the treatment with the dehalogenating agent described later.

  Examples of the solvent used for recrystallization are the same as the examples of the solvent used for the reaction in the treatment with the dehalogenating agent described later.

  As adsorption, treatment with an adsorbent is preferred. Moreover, as an adsorption agent, Preferably, they are activated carbon, a silica gel, an alumina, or a celite.

  Treatment with an adsorbent is usually carried out in a solvent. Examples of the solvent used for the treatment with the adsorbent are the same as the examples of the solvent used for the reaction in the treatment with the dehalogenating agent described later.

[Treatment with dehalogenating agent]
As the treatment with a dehalogenating agent, known methods described in the documents such as WO2006 / 037458, JP2007-220772A, JP2007-077078A, WO2005 / 084083 and the like can be used. It can be mentioned.

  Examples of the treatment with a dehalogenating agent include a method of reduction with a hydride reducing agent, a method of reacting a metal or an organic metal compound, and the like.

As a hydride reducing agent, alkali metal hydrides and alkaline earth metal hydrides such as sodium hydride, lithium hydride, calcium hydride and magnesium hydride; lithium aluminum hydride (LAH), hydrogenated diisobutylaluminum (DIBAL) And aluminum hydride compounds such as sodium bis (2-methoxyethoxy) aluminum hydride (Red-Al); diborane (B ₂ H ₆ ), sodium borohydride (NaBH ₄ ) and lithium triethylborohydride (Super-Hydride) And the like; silicon hydride compounds such as silane (SiH ₄ ) and triethylsilane (Et ₃ SiH); and tin hydride compounds such as stannane (SnH ₄ ) and tributyltin hydride (TBT). To be

  In the method of reacting a metal, examples of the metal include lithium, sodium, magnesium and zinc.

  In the method of reacting an organometallic compound, examples of the organometallic compound include organolithium compounds such as butyllithium and phenyllithium; organomagnesium compounds such as Grignard reagent; and organozinc compounds such as diethylzinc.

The treatment with the dehalogenating agent is preferably a method of reacting the compound represented by the formula (Z1) because it can further reduce C ¹ .

［式中、
Ｒ^Ｚ１は、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。
Ｚ^Ｚ１は、置換基Ｚ群からなる群から選ばれる基を表す。］

[In the formula,
R ^Z1 represents an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.
Z ^Z1 represents a group selected from the group consisting of a substituent Z group. ]

<Substituent group Z group>
—B (OR ^C2 ) ₂ (wherein, R ^C2 represents a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. A plurality of R ^{C2 s} are And R 6 may be the same or different, and may be linked to each other to form a ring structure together with the oxygen atom to which they are attached.
A group represented by —BF ₃ Q ′ (wherein Q ′ represents Li, Na, K, Rb or Cs);
A group represented by MgY ′ (wherein Y ′ represents a chlorine atom, a bromine atom or an iodine atom);
A group represented by the formula: ZnY ′ ′ (wherein Y ′ ′ represents a chlorine atom, a bromine atom or an iodine atom);
-Sn ^(R _{C3) 3} ^{(wherein, R C3} represents a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, these groups may have a substituent. More existing ^{R C3} is And groups which may be the same or different and may be linked to each other to form a ring structure together with the tin atoms to which they are attached.

As a group represented by -B (OR <^C2> ) ₂ , the group represented by a following formula (W-1)-(W-10) is illustrated.

R ^Z1 is preferably an aryl group or a monovalent heterocyclic group, more preferably an aryl group, still more preferably a phenyl group, and these groups may have a substituent.

The substituent which R ^Z1 may have is preferably a fluorine atom, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group, an aryloxy group or a substituted amino It is a group, more preferably an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group or a monovalent heterocyclic group, still more preferably an alkyl group, a cycloalkyl group or an alkoxy group, particularly preferably an alkyl group or It is a cycloalkyl group, and these groups may further have a substituent.

The group selected from the substituent Z group is preferably a group represented by -B (OR ^C2 ) ₂ , more preferably a group represented by formula (W-7).

  The treatment with the dehalogenating agent is usually carried out in a solvent. Examples of the solvent used for the reaction include alcohol solvents such as methanol, ethanol, propanol, ethylene glycol, glycerin, 2-methoxyethanol and 2-ethoxyethanol; diethyl ether, tetrahydrofuran (THF), dioxane, cyclopentyl methyl ether, diglyme Ether solvents such as methylene chloride, chloroform etc .; nitrile solvents such as acetonitrile, benzonitrile etc. hydrocarbon solvents such as hexane, decalin, toluene, xylene, mesitylene etc; N, N-dimethylformamide, N Amide solvents such as N, N-dimethylacetamide; acetone, dimethylsulfoxide, water. The solvents may be used alone or in combination of two or more.

  The amount of the solvent used is usually 10 to 100000 parts by mass with respect to 100 parts by mass in total of the phosphorescent compound represented by the formula (1).

  In the treatment with a dehalogenating agent, the reaction time is usually 30 minutes to 150 hours, and the reaction temperature is usually between the melting point and the boiling point of the solvent present in the reaction system.

  In the treatment with a dehalogenating agent, catalysts such as palladium catalyst and nickel catalyst may be used to accelerate the reaction. Examples of the palladium catalyst include, for example, palladium acetate, bis (triphenylphosphine) palladium (II) dichloride, tetrakis (triphenylphosphine) palladium (0), [1,1′-bis (diphenylphosphino) ferrocene] dichloropalladium ( II), tris (dibenzylideneacetone) dipalladium (0). Examples of the nickel catalyst include tetrakis (triphenylphosphine) nickel (0), [1,3-bis (diphenylphosphino) propane) nickel (II) dichloride, bis (1,4-cyclooctadiene) nickel (0) Can be mentioned. The catalyst may be used alone or in combination of two or more.

  The amount of the catalyst used is usually 0.00001 to 3 molar equivalents as the amount of transition metal relative to the total number of moles of the phosphorescent compound represented by the formula (1).

  The palladium catalyst or nickel catalyst may be used in combination with a phosphorus compound such as triphenylphosphine, tri (o-tolyl) phosphine, tri (tert-butyl) phosphine, tricyclohexylphosphine, 1,1'-bis (diphenylphosphino) ferrocene and the like. May be The phosphorus compounds may be used alone or in combination of two or more.

  In the treatment with a dehalogenating agent, a base and a phase transfer catalyst may be used to accelerate the reaction. Also, if necessary, the catalyst may be used in combination with a base and / or a phase transfer catalyst.

  As a base and a phase transfer catalyst, for example, inorganic bases such as sodium carbonate, potassium carbonate, cesium carbonate, potassium fluoride, cesium fluoride, tripotassium phosphate and the like; tetrabutyl ammonium fluoride, tetraethyl ammonium hydroxide, tetra hydroxide hydroxide Organic bases such as butyl ammonium; phase transfer catalysts such as tetrabutyl ammonium chloride and tetrabutyl ammonium bromide. The base and the phase transfer catalyst may be used alone or in combination of two or more.

  The amount of the base and the phase transfer catalyst used is usually 0.001 to 100 molar equivalents relative to the total number of moles of the phosphorescent compound represented by formula (1).

  When the reaction is carried out twice or more in the treatment with a dehalogenating agent, they may be reacted under the same conditions or may be reacted under different conditions.

As a method of reducing C ¹ , it is preferable to carry out treatment with a dehalogenating agent because it can further reduce C ¹ , and it is more preferable to carry out both purification and treatment with a dehalogenating agent, and sublimation and / or re-treatment. It is further preferred to carry out both crystallization and treatment with a dehalogenating agent, and it is particularly preferred to carry out both recrystallization and treatment with a dehalogenating agent.

[Host material]
Next, the host material to be blended in the composition according to the present embodiment will be described.

  The host material is a compound composed of typical elements other than chlorine atoms.

  The host material preferably has at least one function selected from the group consisting of light emitting property, hole injecting property, hole transporting property, electron injecting property and electron transporting property, and the hole injecting property and hole transporting property It is more preferable to have at least one function selected from the group consisting of electron injecting property and electron transporting property.

The lowest excitation triplet state (T ₁ ) of the host material is excellent in the external quantum efficiency of the light emitting device according to this embodiment, and therefore, the energy equivalent to T ₁ of the phosphorescent compound represented by the formula (1) It is preferable that it is a level or a higher energy level.

  As the host material, one or more atoms selected from hydrogen atom, carbon atom, group 13 element, group 14 element (excluding carbon atom), group 15 element, group 16 element and fluorine atom Preferably, a compound composed of a hydrogen atom and a carbon atom, or a hydrogen atom, a carbon atom, a boron atom, a silicon atom, a nitrogen atom, a phosphorus atom, an oxygen atom, a sulfur atom And a compound composed of one or more atoms selected from a selenium atom and a fluorine atom, more preferably a compound composed of a hydrogen atom and a carbon atom, or a hydrogen atom, a carbon atom, and a nitrogen It is a compound composed of one or more atoms selected from an atom, an oxygen atom and a sulfur atom, and more preferably a hydrogen atom, a carbon atom, a nitrogen atom, an oxygen atom and a sulfur atom And particularly preferably a compound composed of a hydrogen atom, a carbon atom, and at least one atom selected from a nitrogen atom and a sulfur atom, particularly preferably Preferred is a compound composed of a hydrogen atom, a carbon atom, a nitrogen atom and a sulfur atom.

  Host materials are classified into low molecular weight compounds (hereinafter also referred to as “low molecular weight host materials”) and high molecular compounds (hereinafter also referred to as “high molecular host materials”), and preferably low molecular weight compounds. .

[Polymer host material]
Examples of the polymer host material include a polymer compound which is a hole transport material described later, and a polymer compound which is an electron transport material described later.

[Molecular host material]
Examples of low molecular weight host materials include compounds having an aromatic hydrocarbon ring composed of a hydrogen atom and a carbon atom, and heterocyclic compounds composed of a typical element, which are composed of a typical element Heterocyclic compounds are preferred.

  The heterocyclic compound in the low molecular weight host material is preferably one selected from a hydrogen atom, a carbon atom, a group 13 element, a group 14 element, a group 15 element, a group 16 element and a fluorine atom. It is a heterocyclic compound composed of the above atoms, more preferably hydrogen atoms, carbon atoms, boron atoms, boron atoms, silicon atoms, nitrogen atoms, phosphorus atoms, oxygen atoms, sulfur atoms, selenium atoms and fluorine atoms A heterocyclic compound composed of one or more atoms selected from the group consisting of: and more preferably a group consisting of a hydrogen atom, a carbon atom, a nitrogen atom, an oxygen atom and a sulfur atom A heterocyclic compound composed of one or more atoms selected from the group consisting of: particularly preferably a group consisting of a group consisting of a hydrogen atom, a carbon atom, a nitrogen atom and a sulfur atom Heterocyclic compound composed of the constituted heterocyclic compound from with one or more atoms barrel.

  In the low molecular weight host material, as a substituent which the aromatic hydrocarbon ring and the heterocycle may have, preferably, a fluorine atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryloxy group, It is an aryl group, a monovalent heterocyclic group or a substituted amino group, more preferably an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group, a monovalent heterocyclic group or a substituted amino group, still more preferably It is an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group or a substituted amino group, particularly preferably an alkyl group, an aryl group or a monovalent heterocyclic group, particularly preferably a monovalent complex It is a ring group, and these groups may further have a substituent.

  In the low molecular weight host material, the heterocyclic compound is preferably a low molecular weight compound (that is, an aromatic heterocyclic compound) having an aromatic heterocycle which may have a substituent.

  In the low molecular weight host material, the preferred range of the atoms constituting the aromatic heterocycle is the same as the preferred range of the atoms constituting the heterocyclic ring in the low molecular weight host material described above.

  In the low molecular weight host material, the preferred range of the substituent which the aromatic heterocycle may have is the same as the preferred range of the substituent which the heterocyclic ring in the low molecular weight host material may have.

  Examples of the aromatic hydrocarbon ring in the low molecular weight host material include benzene ring, naphthalene ring, anthracene ring, fluorene ring, spirobifluorene ring, phenanthrene ring, dihydrophenanthrene ring, pyrene ring, chrysene ring and triphenylene ring. And preferably a benzene ring, a naphthalene ring, a fluorene ring, a spirobifluorene ring, a phenanthrene ring, a dihydrophenanthrene ring, a chrysene ring or a triphenylene ring, more preferably a benzene ring, a fluorene ring or a spirobifluorene ring, More preferably, it is a benzene ring, and these rings may have a substituent.

  The heterocyclic ring in the low molecular weight host material includes, for example, pyrrole ring, furan ring, thiophene ring, oxadiazole ring, thiadiazole ring, thiazole ring, oxazole ring, pyridine ring, diazabenzene ring, triazine ring, quinoline ring, isoquinoline ring, Quinazoline ring, quinoxaline ring, phenanthroline ring, dibenzofuran ring, dibenzothiophene ring, dibenzosilole ring, dibenzophosphole ring, dibenzophosphole ring, carbazole ring, azacarbazole ring, diazacarbazole ring, phenoxazine ring and phenothiazine ring are preferably mentioned, Pyridine ring, diazabenzene ring, triazine ring, quinoline ring, isoquinoline ring, quinazoline ring, quinoxaline ring, phenanthroline ring, dibenzofuran ring, dibenzothiophene ring, carbazole ring, azacarbazo A ring or a diazacarbazole ring, more preferably a pyridine ring, a pyrimidine ring, a triazine ring, a quinoline ring, an isoquinoline ring, a quinazoline ring, a dibenzofuran ring, a dibenzothiophene ring or a carbazole ring, still more preferably a pyridine ring, A pyrimidine ring, a triazine ring, a dibenzofuran ring, a dibenzothiophene ring or a carbazole ring, particularly preferably a dibenzofuran ring, a dibenzothiophene ring or a carbazole ring, particularly preferably a dibenzothiophene ring or a carbazole ring, and these rings May have a substituent.

[Compound represented by formula (H-1)]
The low molecular weight host material is preferably a compound represented by Formula (H-1).

Ar ^H1 and Ar ^{H2 each} represents a phenyl group, a fluorenyl group, a spirobifluorenyl group, a pyridyl group, a pyrimidinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a thienyl group, a benzothienyl group, a dibenzothienyl group, a furyl group, a benzofuryl group Group, dibenzofuryl group, pyrrolyl group, indolyl group, azaindolyl group, carbazolyl group, azacarbazolyl group, diazacarbazolyl group, phenoxazinyl group or phenothiazinyl group, preferably phenyl group, spirobifluorenyl group, Pyridyl, pyrimidinyl, triazinyl, dibenzothienyl, dibenzofuryl, carbazolyl or azacarbazolyl is more preferred, and phenyl, pyridyl, carbazolyl or azacarbazolyl is more preferred. The group represented by the above formula (TDA-1) or (TDA-3) is particularly preferable, the group represented by the above formula (TDA-3) is particularly preferable, and these groups are It may have a substituent.

The substituent that Ar ^H1 and Ar ^H2 may have is preferably a fluorine atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and the alkyl group An alkyl group, an alkoxy group or a cycloalkoxy group is more preferable, an alkyl group or a cycloalkoxy group is more preferable, and these groups may further have a substituent.

n ^H1 is preferably 1. n ^H2 is preferably 0.

n ^H3 is usually an integer of 0 or more and 10 or less, preferably an integer of 0 or more and 5 or less, more preferably an integer of 1 or more and 3 or less, and particularly preferably 1.

n ^H11 is preferably an integer of 1 or more and 5 or less, more preferably an integer of 1 or more and 3 or less, and still more preferably 1.

R ^H11 is preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably a hydrogen atom, an alkyl group or a cycloalkyl group, a hydrogen atom or an alkyl group It is further preferable that these groups have one or more substituents.

L ^H1 is preferably an arylene group or a divalent heterocyclic group.

L ^H1 is represented by any one of formulas (A-1) to (A-3), formulas (A-8) to (A-10), formulas (AA-1) to (AA-6), and formulas (AA-10) to It is preferably a group represented by (AA-21) or Formula (AA-24) to (AA-34), Formula (A-1), Formula (A-2), Formula (A-8), Groups represented by Formula (A-9), Formula (AA-1) to (AA-4), Formula (AA-10) to (AA-15) or Formula (AA-29) to (AA-34) It is more preferable that the formula (A-1), the formula (A-2), the formula (A-8), the formula (A-9), the formula (AA-2), the formula (AA-4) and the formula It is further preferable that the group is a group represented by (AA-10) to (AA-15), and the formula (A-1), the formula (A-2), the formula (A-8), the formula (AA-2) Formula (AA-4), formula (AA-10), formula (AA-12) or formula (AA) It is particularly preferable that it is a group represented by formula (A-1), formula (A-2), formula (AA-2), formula (AA-4), formula (AA-10), Particularly preferred is a group represented by formula (AA-12) or formula (AA-14), and a group represented by formula (AA-10), formula (AA-12) or formula (AA-14) Is particularly preferred, and the group represented by formula (AA-14) is most preferred.

As the substituent which L ^H1 may have, a fluorine atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group is preferable, and an alkyl group, an alkoxy group, an aryl group A group or a monovalent heterocyclic group is more preferable, an alkyl group, an aryl group or a monovalent heterocyclic group is further preferable, and these groups may further have a substituent.

L ^H21 is preferably a single bond or an arylene group, more preferably a single bond, and the arylene group may have a substituent.

The definition and examples of the arylene group or divalent heterocyclic group represented by L ^H21 are the same as the definitions and examples of the arylene group or divalent heterocyclic group represented by L ^H1 .

R ^H21 is preferably an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.

The definitions and examples of the aryl group and monovalent heterocyclic group represented by R ^H21 are the same as the definitions and examples of the aryl group and monovalent heterocyclic group represented by Ar ^H1 and Ar ^H2 .

The definition and the example of the substituent which R ^H21 may have are the same as the definition and the example of the substituent which Ar ^H1 and Ar ^H2 may have.

  The compound represented by formula (H-1) is preferably a compound represented by formula (H-2).

［式中、Ａｒ^Ｈ１、Ａｒ^Ｈ２、ｎ^Ｈ３及びＬ^Ｈ１は、前記と同じ意味を表す。］

[Wherein, Ar ^H1 , Ar ^H2 , n ^H3 and L ^H1 represent the same meaning as described above. ]

  As low molecular weight host materials, compounds represented by the following formulas (H-101) to (H-118) are exemplified.

[Method for obtaining low molecular weight host material]
Low molecular weight host materials are available from Aldrich, Luminescence Technology Corp. It is available from
In addition, as a method of obtaining other than the above, WO2006 / 121811, WO2007 / 07153, WO2009 / 086028, WO2009 / 096202, JP2009-46408A, and the like are particularly available. It can obtain by manufacturing by the well-known method as described in literature, such as opening 2009-267255 gazette.

[Method of reducing the amount of chlorine atoms (C ^H ) contained in the low molecular weight host material]
Examples of methods for reducing the amount of chlorine atoms contained as impurities in the low molecular weight host material include at least one method selected from purification and treatment with a dehalogenating agent, and are included in the low molecular weight host material Purification is preferable, sublimation and / or recrystallization are more preferable, and sublimation is even more preferable because the amount of chlorine atoms can be further reduced.

Examples, definitions and preferred ranges of purification and treatment with a dehalogenating agent in the method for reducing the amount of chlorine atoms contained in a low molecular weight host material are the examples of purification and treatment with a dehalogenating agent in the aforementioned method for reducing C ¹ , The same as the definition and the preferred range.

  In the treatment with the dehalogenating agent in the method for reducing the amount of chlorine atoms contained in the low molecular weight host material, the amount of the solvent used is usually 10 to 100000 parts by mass with respect to 100 parts by mass in total of the low molecular weight host material is there.

  In the treatment with a dehalogenating agent in a method for reducing the amount of chlorine atoms contained in a low molecular weight host material, the amount of catalyst used is generally 0, relative to the amount of transition metal relative to the total number of moles of low molecular weight host material. It is .00001-3 molar equivalent.

  In the treatment with the dehalogenating agent in the method of reducing the amount of chlorine atoms contained in the low molecular weight host material, the amounts of the base and the phase transfer catalyst used are generally 0. 001 to 100 molar equivalents.

The amount (C ^H ) of chlorine atoms contained as impurities in the host material is not particularly limited, but is usually less than 50 mass ppm with respect to the total amount of the host material, and the initial deterioration of the light emitting device according to this embodiment Because it is suppressed, it is preferably less than 30 mass ppm, more preferably 9 mass ppm or less, still more preferably 5 mass ppm or less, particularly preferably 1 mass ppm or less, particularly preferably 0 mass ppm It is.

Specific calculation methods of the C ^H can be determined in the same manner as the specific method for calculating the C ¹ described above.

For example, in the same manner as the specific method for calculating the ^{C 1} in Example D1 described above, in Example D1, the ^{C H} is 0 mass ppm.

<Composition>
The composition according to the present embodiment is a composition in which the phosphorescent compound represented by the formula (1) and the host material are blended, and the amount of chlorine atoms contained as an impurity in the phosphorescent compound is a composition It is 3.5 mass ppm or less with respect to the whole solid content mix | blended with things.

  In the composition according to the present embodiment, the phosphorescent compound represented by the formula (1) may be blended singly or in combination of two or more. Further, in the composition according to the present embodiment, the host material may be blended singly or in combination of two or more.

  In the composition according to the present embodiment, the total amount of the chlorine atom contained as an impurity in the phosphorescent compound and the chlorine atom contained as an impurity in the host material is the present embodiment relative to the total amount of solid content compounded in the composition. Preferably, the amount is 3.5 mass ppm or less, more preferably 3.1 mass ppm or less, and still more preferably 2.7 mass ppm or less, because the initial deterioration of the light emitting device according to Is preferably 2.3 ppm by weight or less, particularly preferably 1.8 ppm by weight or less, particularly preferably 1.2 ppm by weight, and even more preferably 0.8 ppm by weight or less. It is preferably at most 0.3 ppm by weight, very particularly preferably at 0 ppm by weight.

  In the composition according to the present embodiment, the total amount of chlorine atoms contained as impurities in the phosphorescent compound and the chlorine atoms contained as impurities in the host material is the total amount of solids contained in the composition. Since the light emission efficiency of the light emitting device according to the embodiment is excellent, it is preferably 0.01 mass ppm or more and 3.0 mass ppm or less, more preferably 0.02 mass ppm or more and 2.7 mass ppm or less, and further preferably Is 0.05 mass ppm or more and 2.5 mass ppm or less, particularly preferably 0.1 mass ppm or more and 2.3 mass ppm or less, and particularly preferably 0.2 mass ppm or more and 2.3 mass ppm or less is there.

  In the composition according to the present embodiment, the total amount of chlorine atoms contained as impurities in the phosphorescent compound and the chlorine atoms contained as impurities in the host material is the total amount of solids contained in the composition. The initial deterioration of the light emitting device according to the embodiment is suppressed, and the light emission efficiency of the light emitting device according to the embodiment is excellent, so that it is preferably 0.01 mass ppm or more and 2.3 mass ppm or less, more preferably 0. .02 mass ppm or more and 1.8 mass ppm or less, more preferably 0.05 mass ppm or more and 1.2 mass ppm or less, particularly preferably 0.1 mass ppm or more and 0.8 mass ppm or less.

For example, when the solid content to be blended in the composition according to the present embodiment is only the phosphorescent compound and the host material, chlorine atoms contained as impurities in the phosphorescent compound and chlorine atoms contained as impurities in the host material The total amount (mass ppm) is the ratio of the mass of the phosphorescent compound represented by the formula (1) to the total mass of the phosphorescent compound represented by the formula (1) and the host material as W ¹ , to the total weight of the phosphorescent compound and a host material represented by 1), when the ratio of the total weight of the host material was set to W ^H, is represented by ^{C 1 W 1 + C H W} H.

Since W ¹ is usually 0.0001 to 0.90 and the initial deterioration of the light emitting device according to this embodiment is further suppressed, it is preferably 0.01 to 0.60, and 0.10 to 0.10. More preferably, it is 0.40.

The specific method for calculating the W ¹ with Example D1 and Example D2 described later, it will be described.

  First, in Example D1, the mass ratio of the compound HM-1 (host material) to the phosphorescent compound MC3 is compound HM-1: phosphorescent compound MC3 = 75: 25.

Therefore, W ¹ can be determined from the amount of preparation, and is determined as follows.
W ¹ = 25 / (75 + 25) = 0.25

  In Example D2, the mass ratio of the compound HM-1, the phosphorescent compound MC3 and the phosphorescent compound MC2 is compound HM-1: phosphorescent compound MC3: phosphorescent compound MC2 = 75: 22.5: It is 2.5.

Therefore, W ¹ can be determined from the amount of preparation, and is determined as follows.
W ¹ = (22.5 + 2.5) / (75 + 22.5 + 2.5) = 0.25

Similarly, W ¹ in Example D3 is determined as follows.
W ¹ = (12.5 + 12.5) / (75 + 12.5 + 12.5) = 0.25

Similarly, W ¹ in Example D4 is determined as follows.
W ¹ = 25 / (75 + 25) = 0.25

Similarly, W ¹ in Example D5 is determined as follows.
W ¹ = (12.5 + 12.5) / (75 + 12.5 + 12.5) = 0.25

Similarly, W ¹ in Comparative Example CD1 is determined as follows.
W ¹ = 25 / (75 + 25) = 0.25

Since W ^H is usually 0.1 to 0.9999 and the initial deterioration of the light emitting device according to this embodiment is further suppressed, it is preferably 0.40 to 0.99, and 0.60 to 0.99. It is more preferable that it is 0.90.

The specific calculation method of W ^{H can be obtained in} the same manner as the specific calculation method of W ¹ .

For example, in the same manner as the specific calculation method of W ¹ in the above-mentioned Example D1, W ^H in Example D1 is determined as follows.
W ^H = 75 / (75 + 25) = 0.75

As described above, C ¹ W ¹ + C ^H W ^H can be calculated by calculating C ¹ , C ^H , W ¹ and W ^H.

For example, C ¹ W ¹ + C ^H W ^H in Example D1 is determined as follows.
C ¹ W ¹ + C ^H W ^H = (0 × 0.25) + (0 × 0.75) = 0 mass ppm

C ¹ W ¹ + C ^H W ^H in Example D2 is determined as follows.
C ¹ W ¹ + C ^H W ^H = (0.9 × 0.25) + (0 × 0.75) = 0.23 mass ppm

C ¹ W ¹ + C ^H W ^H in Example D3 is determined as follows.
C ¹ W ¹ + C ^H W ^H = (4.5 × 0.25) + (0 × 0.75) = 1.13 mass ppm

C ¹ W ¹ + C ^H W ^H in Example D4 is determined as follows.
C ¹ W ¹ + C ^H W ^H = (9 × 0.25) + (0 × 0.75) = 2.25 mass ppm

C ¹ W ¹ + C ^H W ^H in Example D5 is determined as follows.
C ¹ W ¹ + C ^H W ^H = (12.5 × 0.25) + (0 × 0.75) = 3.13 mass ppm

C ¹ W ¹ + C ^H W ^H in Comparative Example CD1 is determined as follows.
C ¹ W ¹ + C ^H W ^H = (16 × 0.25) + (0 × 0.75) = 4.00 mass ppm

C ¹ W ¹ + C 3 ^H W ^H is 3.5 mass ppm or less and the initial deterioration of the light emitting device according to this embodiment is suppressed, so it is preferably 3.1 mass ppm or less, more preferably 2. It is 7 mass ppm or less, more preferably 2.3 mass ppm or less, particularly preferably 1.8 mass ppm or less, particularly preferably 1.2 mass ppm, particularly preferably 0.8 mass It is at most ppm, particularly preferably at most 0.3 ppm by weight, most preferably at 0 ppm by weight.

In addition, C ¹ W ¹ + C ^H W ^H is preferably 0.01 mass ppm or more and 3.0 mass ppm or less, more preferably 0.02 mass ppm, because the light emission efficiency of the light emitting device according to the present embodiment is excellent. ppm or more and 2.7 mass ppm or less, more preferably 0.05 mass ppm or more and 2.5 mass ppm or less, particularly preferably 0.1 mass ppm or more and 2.3 mass ppm or less, particularly preferably It is 0.2 mass ppm or more and 2.3 mass ppm or less.

In addition, C ¹ W ¹ + C ^H W ^H is preferably 0.01 mass ppm or more because the initial deterioration of the light emitting device according to the present embodiment is suppressed and the light emission efficiency of the light emitting device according to the present embodiment is excellent. It is 2.3 mass ppm or less, more preferably 0.02 mass ppm or more and 1.8 mass ppm or less, still more preferably 0.05 mass ppm or more and 1.2 mass ppm or less, particularly preferably 0. It is 1 mass ppm or more and 0.8 mass ppm or less.

The composition according to the present embodiment preferably further satisfies the formula (2 ′).
C ^H ≦ C ¹ ≦ 15 mass ppm (2 ′)
[Wherein, C ¹ and C ^H represent the same meaning as described above. ]

  Formula (2 ′) is preferably formula (2′-1), more preferably formula (2′-2), still more preferably formula (2′-3), and particularly preferably 2'-4), particularly preferably of the formula (2'-5).

C ^H ≦ C ¹ ≦ 13 mass ppm (2′-1)
C ^H ≦ C ¹ ≦ 9 mass ppm (2′-2)
C ^H ≦ C ¹ ≦ 5 mass ppm (2′-3)
C ^H ≦ C ¹ ≦ 1 mass ppm (2′-4)
C ^H = C ¹ = 0 mass ppm (2′-5)
[Wherein, C ¹ and C ^H represent the same meaning as described above. ]

  The compounding amount of the phosphorescent compound represented by the formula (1) in the composition according to the present embodiment is not particularly limited, but it is 0.01 to 90% by mass on the basis of the total solid content compounded in the composition May be present, preferably 1 to 60% by mass, and more preferably 10 to 40% by mass.

  Although the compounding quantity of the host material in the composition according to the present embodiment is not particularly limited, it may be 10 to 99.99% by mass, 40 to 99% by mass on the basis of the total solid content to be compounded in the composition. It is preferable that it is 60 to 90% by mass.

[Other ingredients]
The composition according to this embodiment is a hole transport material, a hole injection material, an electron transport material, an electron injection material, a light emitting material (different from the phosphorescent compound represented by the formula (1) and the host material). It may further contain at least one material selected from the group consisting of an antioxidant and a solvent. However, the hole transport material, the hole injection material, the electron transport material and the electron injection material are different from the host material.

  When the composition according to the present embodiment further contains at least one material selected from the group consisting of a hole transport material, a hole injection material, an electron transport material, an electron injection material, a light emitting material, and an antioxidant, It is preferable to reduce the amount of chlorine atoms contained in these materials by at least one method selected from the above-mentioned purification and the above-mentioned treatment with a dehalogenating agent.

[Hole transport material]
Hole transport materials are classified into low molecular weight compounds and high molecular weight compounds, and are preferably high molecular weight compounds. The hole transport material may have a crosslinking group.

  Examples of the polymer compound include polyvinylcarbazole and derivatives thereof; polyarylenes having an aromatic amine structure in the side chain or main chain and derivatives thereof. The macromolecular compound may be a compound having an electron accepting moiety bound thereto. Examples of the electron accepting moiety include fullerene, tetrafluorotetracyanoquinodimethane, tetracyanoethylene, trinitrofluorenone and the like, with preference given to fullerene.

  In the composition according to the present embodiment, the compounding amount of the hole transport material is usually 1 to 400 mass, assuming that the total of the phosphorescent compound represented by the formula (1) and the host material is 100 parts by mass. Part, preferably 5 to 150 parts by mass.

  The hole transport material may be used alone or in combination of two or more.

[Electron transport material]
Electron transport materials are classified into low molecular weight compounds and high molecular weight compounds. The electron transport material may have a crosslinking group.

  As a low molecular weight compound, for example, metal complexes having 8-hydroxyquinoline as a ligand, oxadiazole, anthraquinodimethane, benzoquinone, naphthoquinone, anthraquinone, tetracyanoanthraquinodimethane, fluorenone, diphenyldicyanoethylene and diphenoquinone And as well as their derivatives.

  As a high molecular compound, polyphenylene, polyfluorene, and these derivatives are mentioned, for example. The polymer compound may be doped with metal.

  In the composition according to the present embodiment, the compounding amount of the electron transporting material is usually 1 to 400 parts by mass, assuming that the total of the phosphorescent compound represented by the formula (1) and the host material is 100 parts by mass. Preferably it is 5-150 mass parts.

  The electron transporting material may be used alone or in combination of two or more.

[Hole Injection Material and Electron Injection Material]
The hole injecting material and the electron injecting material are classified into low molecular weight compounds and high molecular weight compounds, respectively. The hole injecting material and the electron injecting material may have a crosslinking group.

  As a low molecular weight compound, metal phthalocyanines, such as copper phthalocyanine; Carbon; Metal oxides, such as molybdenum and tungsten; Metal fluorides, such as lithium fluoride, sodium fluoride, cesium fluoride, potassium fluoride, etc. are mentioned, for example.

  As the polymer compound, for example, polyaniline, polythiophene, polypyrrole, polyphenylene vinylene, polythienylene vinylene, polyquinoline and polyquinoxaline, and derivatives thereof; conductive materials such as polymers containing an aromatic amine structure in the main chain or side chain Polymers are included.

  In the composition according to the present embodiment, when the compounding amount of the hole injecting material and the electron injecting material is 100 parts by mass of the total of the phosphorescent compound represented by the formula (1) and the host material, Usually, it is 1 to 400 parts by mass, preferably 5 to 150 parts by mass.

  Each of the electron injecting material and the hole injecting material may be used alone or in combination of two or more.

[Ion doping]
When the hole injecting material or the electron injecting material contains a conductive polymer, the conductivity of the conductive polymer is preferably 1 × 10 ⁻⁵ S / cm to 1 × 10 ³ S / cm. The conductive polymer can be doped with an appropriate amount of ions in order to bring the conductivity of the conductive polymer into such a range.

  The type of ion to be doped is an anion if it is a hole injecting material, and a cation if it is an electron injecting material. Examples of the anion include polystyrene sulfonate ion, alkyl benzene sulfonate ion and camphor sulfonate ion. Examples of the cation include lithium ion, sodium ion, potassium ion and tetrabutyl ammonium ion.

  The ions to be doped may be used alone or in combination of two or more.

[Light emitting material]
Light emitting materials (different from the phosphorescent compound represented by the formula (1) and the host material) are classified into low molecular weight compounds and high molecular weight compounds. The light emitting material may have a crosslinking group.

  Examples of low molecular weight compounds include naphthalene and its derivatives, anthracene and its derivatives, and perylene and its derivatives.

  As the polymer compound, for example, phenylene group, naphthalenediyl group, anthracenediyl group, fluorenediyl group, phenanthrendiyl group, dihydrophenanthendiyl group, group represented by formula (X), carbazole diyl group, phenoxazine diyl Examples thereof include polymer compounds containing a group, phenothiazine diyl group, pyrene diyl group and the like.

  The light emitting material preferably comprises a triplet light emitting complex and a polymer compound.

  As a triplet light emission complex, the metal complex shown below is mentioned, for example.

  In the composition according to the present embodiment, the compounding amount of the light emitting material is usually 0.1 to 400 mass, assuming that the total of the phosphorescent compound represented by the formula (1) and the host material is 100 parts by mass. Part, preferably 1 to 150 parts by mass.

  The light emitting materials may be used alone or in combination of two or more.

[Antioxidant]
The antioxidant may be a compound which is soluble in the same solvent as the phosphorescent compound represented by the formula (1) and the host material and does not inhibit light emission and charge transport, for example, a phenolic antioxidant, A phosphorus antioxidant is mentioned.

  In the composition according to the present embodiment, the blending amount of the antioxidant is generally 0.001 to 10, when the total of the phosphorescent compound represented by the formula (1) and the host material is 100 parts by mass. It is a mass part.

  The antioxidant may be used alone or in combination of two or more.

[ink]
A composition containing the phosphorescent compound represented by the formula (1), a host material, and a solvent (hereinafter, also referred to as “ink”) is a spin coating method, a casting method, a microgravure coating method, gravure Coating method, bar coating method, roll coating method, wire bar coating method, dip coating method, spray coating method, screen printing method, flexo printing method, offset printing method, ink jet printing method, capillary coating method, nozzle coating method, etc. It can be used suitably for the coating method.

  The viscosity of the ink may be adjusted according to the type of application method, but when a solution such as an inkjet printing method is applied to a printing method via an ejection device, clogging and flight bending during ejection are less likely to occur. Preferably, it is 1 to 20 mPa · s at 25 ° C.

  The solvent contained in the ink is preferably a solvent that can dissolve or uniformly disperse the solid content in the ink. As the solvent, for example, chlorinated solvents such as 1,2-dichloroethane, 1,1,2-trichloroethane, chlorobenzene, o-dichlorobenzene; ether solvents such as THF, dioxane, anisole, 4-methylanisole; toluene, Aromatic hydrocarbon solvents such as xylene, mesitylene, ethylbenzene, n-hexylbenzene, cyclohexylbenzene; cyclohexane, methylcyclohexane, n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n- Aliphatic hydrocarbon solvents such as decane, n-dodecane and bicyclohexyl; ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone and acetophenone; esters such as ethyl acetate, butyl acetate, ethyl cellsolve acetate, methyl benzoate and phenyl acetate system Solvents; polyhydric alcohol solvents such as ethylene glycol, glycerin and 1,2-hexanediol; alcohol solvents such as isopropyl alcohol and cyclohexanol; sulfoxide solvents such as dimethyl sulfoxide; N-methyl-2-pyrrolidone, N, Amide solvents such as N-dimethylformamide may be mentioned. The solvents may be used alone or in combination of two or more.

  In the ink, the blending amount of the solvent is usually 1000 to 100000 parts by mass, preferably 2000 to 20000 parts, assuming that the total of the phosphorescent compound represented by the formula (1) and the host material is 100 parts by mass. It is a mass part.

<Light emitting element>
The light emitting device according to the present embodiment is a light emitting device provided with an organic layer containing the composition according to the present embodiment, or a light emitting device provided with an organic layer containing the phosphorescent compound according to the present embodiment.
The configuration of the light emitting device according to the present embodiment includes, for example, an electrode including an anode and a cathode, an organic layer including the composition according to the present embodiment provided between the electrodes, or the phosphorescent compound according to the present embodiment. And the organic layer with which it was mix | blended.

[Layer structure]
The organic layer containing the composition according to the present embodiment and the organic layer containing the phosphorescent compound according to the present embodiment are generally a light emitting layer, a hole transport layer, a hole injection layer, an electron transport layer and an electron injection One or more layers selected from the group consisting of layers, preferably a light emitting layer. Each of these layers contains a light emitting material, a hole transporting material, a hole injecting material, an electron transporting material, and an electron injecting material. Each of these layers is prepared by using the ink prepared by dissolving the light emitting material, the hole transporting material, the hole injecting material, the electron transporting material, and the electron injecting material in the above-described solvent, to form the above-described film and It can be formed using the same method.

  The light emitting element has a light emitting layer between the anode and the cathode. The light emitting device according to the present embodiment preferably has at least one of a hole injecting layer and a hole transporting layer between the anode and the light emitting layer from the viewpoint of the hole injecting property and the hole transporting property. From the viewpoint of electron injecting property and electron transporting property, it is preferable to have at least one layer of an electron injecting layer and an electron transporting layer between the cathode and the light emitting layer.

  As materials of the hole transport layer, the electron transport layer, the light emitting layer, the hole injection layer and the electron injection layer, in addition to the composition according to the present embodiment and the phosphorescent compound according to the present embodiment, the positive Examples include hole transporting materials, electron transporting materials, light emitting materials, hole injecting materials, and electron injecting materials.

  When the light emitting device according to this embodiment has a hole transport layer, as a hole transport material used to form the hole transport layer, a structural unit represented by the following formula (X) and a formula (3) It is also referred to as “polymer compound of hole transport layer” (hereinafter referred to as “polymer compound of hole transport layer”) including at least one structural unit selected from the group consisting of the structural unit represented and the structural unit represented by formula (4). Is preferred. The polymer compound of the hole transport layer may further contain a constitutional unit represented by the following formula (Y).

［式中、
ａ^Ｘ１及びａ^Ｘ２は、それぞれ独立に、０以上の整数を表す。
Ａｒ^Ｘ１及びＡｒ^Ｘ３は、それぞれ独立に、アリーレン基又は２価の複素環基を表し、これらの基は置換基を有していてもよい。
Ａｒ^Ｘ２及びＡｒ^Ｘ４は、それぞれ独立に、アリーレン基、２価の複素環基、又は、少なくとも１種のアリーレン基と少なくとも１種の２価の複素環基とが直接結合した２価の基を表し、これらの基は置換基を有していてもよい。Ａｒ^Ｘ２及びＡｒ^Ｘ４が複数存在する場合、それらは同一でも異なっていてもよい。
Ｒ^Ｘ１、Ｒ^Ｘ２及びＲ^Ｘ３は、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。
Ｒ^Ｘ２及びＲ^Ｘ３が複数存在する場合、それらは同一でも異なっていてもよい。］

[In the formula,
Each of a ^X1 and a ^X2 independently represents an integer of 0 or more.
Ar ^X1 and Ar ^X3 each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent.
Ar ^X2 and Ar ^X4 are each independently an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded These groups may have a substituent. When a plurality of Ar ^X2 and Ar ^X4 exist, they may be the same or different.
Each of R ^X1 , R ^X2 and R ^X3 independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.
When a plurality of R ^X2 and R ^X3 exist, they may be the same or different. ]

The initial deterioration of the light emitting device according to this embodiment is further suppressed, and a ^X1 is preferably 2 or less, and more preferably 1.

The initial deterioration of the light emitting device according to this embodiment is further suppressed, and a ^X2 is preferably 2 or less, more preferably 0.

R ^X1 , R ^X2 and R ^X3 are preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups have a substituent It is also good.

The arylene group represented by Ar ^X1 and Ar ^X3 is more preferably a group represented by Formula (A-1) or Formula (A-9), and still more preferably represented by Formula (A-1) These groups may have a substituent.

The divalent heterocyclic group represented by Ar ^X1 and Ar ^X3 is more preferably represented by formula (AA-1), formula (AA-2) or formula (AA-7)-(AA-26) These groups may have a substituent.

Ar ^X1 and Ar ^X3 are preferably arylene groups which may have a substituent.

The arylene group represented by Ar ^X2 and Ar ^X4 is more preferably a group represented by the formula (A-1), a formula (A-6), a formula (A-7) or a formula (A-9)-(A-11) Or a group represented by formula (A-19), and these groups may have a substituent.

The more preferable range of the divalent heterocyclic group represented by Ar ^X2 and Ar ^X4 is the same as the more preferable range of the divalent heterocyclic group represented by Ar ^X1 and Ar ^X3 .

More preferable range of an arylene group and a divalent heterocyclic group in a divalent group in which at least one arylene group represented by Ar ^X2 and Ar ^X4 and at least one divalent heterocyclic group are directly bonded The more preferable range is the same as the more preferable range or the more preferable range of the arylene group and the divalent heterocyclic group represented by Ar ^X1 and Ar ^X3 respectively.

Examples of the divalent group in which at least one arylene group represented by Ar ^X2 and Ar ^X4 and at least one divalent heterocyclic group are directly bonded to each other include at least one represented by Ar ^Y1 of the formula (Y) The same groups as the divalent group in which one kind of arylene group and at least one kind of divalent heterocyclic group are directly bonded to each other can be mentioned.

Ar ^X2 and Ar ^X4 are preferably arylene groups which may have a substituent.

The substituent which the group represented by Ar ^{X1 to} Ar ^X4 and R ^{X1 to} R ^X3 may have is preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups further have a substituent. It may be done.

  The constitutional unit represented by the formula (X) is preferably a constitutional unit represented by the formula (X-1)-(X-7), more preferably the formula (X-1)-(X-6) Or a structural unit represented by the formula (X-3)-(X-6).

［式中、Ｒ^Ｘ４及びＲ^Ｘ５は、それぞれ独立に、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基、アリールオキシ基、フッ素原子、１価の複素環基又はシアノ基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｘ４は、同一でも異なっていてもよい。複数存在するＲ^Ｘ５は、同一でも異なっていてもよく、隣接するＲ^Ｘ５同士は互いに結合して、それぞれが結合する炭素原子と共に環を形成していてもよい。］

[Wherein, R ^X4 and R ^X5 are each independently a hydrogen atom, alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryl group, aryloxy group, fluorine atom, monovalent heterocyclic group or cyano Represents a group, and these groups may have a substituent. A plurality of R ^X4 may be the same or different. Plural R ^{X5 s} may be the same or different, and adjacent R ^{X5 s} may be bonded to each other to form a ring together with the carbon atoms to which they are bonded. ]

  As a structural unit represented by Formula (X), the structural unit represented by Formula (X1-1)-(X1-11) is mentioned, for example, Preferably it is Formula (X1-3)-(X1-10) It is a structural unit represented by).

  In the polymer compound of the hole transport layer, the structural unit represented by the formula (X) may be contained alone or in combination of two or more.

  When the light emitting device according to the present embodiment has a hole transport layer obtained by using the polymer compound of the hole transport layer, the hole transport layer is a layer containing the polymer compound of the hole transport layer as it is. The hole transport layer may be a layer containing a cross-linked intramolecular or intermolecular or intramolecular or intermolecular crosslinker (crosslinked body). It is preferable that it is a layer containing the crosslinked body of the high molecular compound of a layer. The crosslinked product of the polymer compound of the hole transport layer may be one in which the polymer compound of the hole transport layer and the other material are crosslinked between molecules.

  The structural unit represented by the above formula (X) is excellent in the hole transportability of the polymer compound of the hole transport layer, and therefore, relative to the total amount of the structural units contained in the polymer compound of the hole transport layer, Preferably it is 1-99 mol%, More preferably, it is 10-80 mol%, More preferably, it is 20-70 mol%.

［式中、
ｎＡは０〜５の整数を表し、ｎは１〜４の整数を表す。
Ａｒ^１は、芳香族炭化水素基又は複素環基を表し、これらの基は置換基を有していてもよい。
Ｌ^Ａは、アルキレン基、シクロアルキレン基、アリーレン基、２価の複素環基、−ＮＲ’−で表される基、酸素原子又は硫黄原子を表し、これらの基は置換基を有していてもよい。Ｒ’は、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。Ｌ^Ａが複数存在する場合、それらは同一でも異なっていてもよい。
Ｘは、上記式（ＸＬ−１）〜（ＸＬ−１７）のいずれかで表される架橋基を表す。Ｘが複数存在する場合、それらは同一でも異なっていてもよい。］

[In the formula,
nA represents an integer of 0 to 5, and n represents an integer of 1 to 4.
Ar ¹ represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent.
L ^A is an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, the group represented by -NR'-, an oxygen atom or a sulfur atom, these groups have a substituent It is also good. R ′ represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. If L ^A is plurally present, they may be the same or different.
X represents a crosslinking group represented by any of the above formulas (XL-1) to (XL-17). When two or more X exist, they may be same or different. ]

  nA is preferably an integer of 0 to 3, and more preferably an integer of 0 to 2 because the light emission efficiency of the light emitting device according to the present embodiment is excellent.

  n is preferably 1 or 2, and more preferably 2, because the light emission efficiency of the light emitting device according to this embodiment is excellent.

Ar ¹ is preferably an aromatic hydrocarbon group which may have a substituent, because the light emission efficiency of the light emitting device according to this embodiment is excellent.

The carbon atom number of the aromatic hydrocarbon group represented by Ar ¹ is usually 6 to 60, preferably 6 to 30, and more preferably 6 to 18, not including the carbon atom number of the substituent. is there.
The arylene group moiety excluding the n substituents of the aromatic hydrocarbon group represented by Ar ¹ is preferably a group represented by Formula (A-1) to Formula (A-20), More preferably, a group represented by Formula (A-1), Formula (A-2), Formula (A-6) to Formula (A-10), Formula (A-19) or Formula (A-20) And more preferably a group represented by Formula (A-1), Formula (A-2), Formula (A-7), Formula (A-9) or Formula (A-19).

The carbon atom number of the heterocyclic group represented by Ar ¹ is usually 2 to 60, preferably 3 to 30, and more preferably 4 to 18, not including the carbon atom number of the substituent.
The divalent heterocyclic group moiety excluding the n substituents of the heterocyclic group represented by Ar ¹ is preferably a group represented by formulas (AA-1) to (AA-34) .

The aromatic hydrocarbon group and the heterocyclic group represented by Ar ¹ may have a substituent. Examples of the substituent which the aromatic hydrocarbon group and the heterocyclic group may have include an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a fluorine atom, and a monovalent group. Heterocyclic groups and cyano groups are included.

Alkylene group represented by L ^A is not including the carbon atom number of substituent is usually 1 to 20, preferably 1 to 15, more preferably 1 to 10. Cycloalkylene group represented by L ^A is not including the carbon atom number of substituent is usually 3 to 20.
The alkylene group and the cycloalkylene group may have a substituent, and examples thereof include a methylene group, an ethylene group, a propylene group, a butylene group, a hexylene group, a cyclohexylene group and an octylene group.

Alkylene group and cycloalkylene group represented by L ^A may have a substituent.
As a substituent which the alkylene group and the cycloalkylene group may have, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, a fluorine atom, and a cyano group are mentioned, for example.

Arylene group represented by L ^A may have a substituent. The arylene group is preferably a phenylene group or a fluorenediyl group, more preferably an m-phenylene group, a p-phenylene group, a fluorene-2,7-diyl group or a fluorene-9,9-diyl group. Examples of the substituent which the arylene group may have include an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent heterocyclic group, a fluorine atom, a cyano group and a bridge A crosslinking group selected from the group A group can be mentioned.

The divalent heterocyclic group represented by L ^A, preferably a group of the formula (AA-1) ~ (AA -34).

L ^A is preferably an arylene group or an alkylene group, and more preferably a phenylene group, a fluorenediyl group or an alkylene group, since it facilitates the synthesis of the polymer compound of the hole transport layer. The group may have a substituent.

  As the crosslinkable group represented by X, since the crosslinkability of the polymer compound of the hole transport layer is excellent, the compounds of the formulas (XL-1), (XL-3), (XL-7) to (XL-) are preferably used. 10) a cross-linking group represented by (XL-16) or (XL-17), more preferably a group represented by formula (XL-1), (XL-3), (XL-9), (XL-16) Or (XL-17), more preferably a crosslinking group represented by formula (XL-1), (XL-16) or (XL-17), particularly preferably And the crosslinking group represented by the formula (XL-1) or (XL-17).

  The structural unit represented by the formula (3) is preferably 1 for the total amount of structural units contained in the polymer compound of the hole transport layer, since the crosslinkability of the polymer compound of the hole transport layer is excellent. It is -90 mol%, more preferably 3 to 75 mol%, still more preferably 5 to 60 mol%.

  The constituent unit represented by the formula (3) may be contained singly or in combination of two or more kinds in the polymer compound of the hole transport layer.

［式中、
ｍＡは０〜５の整数を表し、ｍは１〜４の整数を表し、ｃは０又は１を表す。ｍＡが複数存在する場合、それらは同一でも異なっていてもよい。
Ａｒ^３は、芳香族炭化水素基、複素環基、又は、少なくとも１種の芳香族炭化水素環と少なくとも１種の複素環とが直接結合した基を表し、これらの基は置換基を有していてもよい。
Ａｒ^２及びＡｒ^４は、それぞれ独立に、アリーレン基又は２価の複素環基を表し、これらの基は置換基を有していてもよい。
Ａｒ^２、Ａｒ^３及びＡｒ^４はそれぞれ、当該基が結合している窒素原子に結合している当該基以外の基と、直接又は酸素原子若しくは硫黄原子を介して結合して、環を形成していてもよい。
Ｋ^Ａは、アルキレン基、シクロアルキレン基、アリーレン基、２価の複素環基、−ＮＲ’’−で表される基、酸素原子又は硫黄原子を表し、これらの基は置換基を有していてもよい。Ｒ’’は、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。Ｋ^Ａが複数存在する場合、それらは同一でも異なっていてもよい。
Ｘ’は、上記式（ＸＬ−１）〜（ＸＬ−１７）のいずれかで表される架橋基、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。但し、少なくとも１つのＸ’は、上記式（ＸＬ−１）〜（ＸＬ−１７）のいずれかで表される架橋基である。］

[In the formula,
mA represents an integer of 0 to 5, m represents an integer of 1 to 4, and c represents 0 or 1. When there are a plurality of mAs, they may be the same or different.
Ar ³ represents an aromatic hydrocarbon group, a heterocyclic group, or a group in which at least one aromatic hydrocarbon ring and at least one heterocyclic ring are directly bonded, and these groups have a substituent It may be
Ar ² and Ar ⁴ each independently represent an arylene group or a divalent heterocyclic group, and these groups may have a substituent.
Ar ² , Ar ³ and Ar ⁴ are each bonded to a group other than the group bonded to the nitrogen atom to which the group is bonded directly or via an oxygen atom or a sulfur atom to form a ring It may be
K ^A represents an alkylene group, a cycloalkylene group, an arylene group, a divalent heterocyclic group, a group represented by -NR ''-, an oxygen atom or a sulfur atom, and these groups have a substituent May be R ′ ′ represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. If K ^A there are a plurality, they may be the same or different.
X ′ represents a bridging group represented by any of the above formulas (XL-1) to (XL-17), a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, Groups may have a substituent. However, at least one X 'is a crosslinking group represented by any of the above formulas (XL-1) to (XL-17). ]

  mA is preferably 0 to 2, more preferably 0 or 1, and still more preferably 0, because the light emission efficiency of the light emitting device according to this embodiment is excellent.

  m is preferably 1 or 2, and more preferably 2, because the light emission efficiency of the light emitting device according to this embodiment is excellent.

  c is preferably 0 because the synthesis of the polymer compound of the hole transport layer is facilitated and the light emission efficiency of the light emitting device according to this embodiment is excellent.

Ar ³ is preferably an aromatic hydrocarbon group which may have a substituent, because the light emission efficiency of the light emitting device according to this embodiment is excellent.

The definition and the example of the arylene group moiety except the m substituents of the aromatic hydrocarbon group represented by Ar ³ are the same as the definitions and the example of the arylene group represented by Ar ^{X 2} in the above-mentioned formula (X) It is.

The definition and examples of the divalent heterocyclic group moiety excluding the m substituents of the heterocyclic group represented by Ar ³ are the same as the divalent heterocyclic group represented by Ar ^X2 in the above-mentioned formula (X) The same as the definition and example of the part.

The definition and examples of the divalent group excluding the m substituents of the group in which at least one aromatic hydrocarbon ring represented by Ar ³ and at least one hetero ring are directly bonded to each other are the same as the aforementioned formula ( It is the same as the definition and example of a divalent group in which at least one arylene group represented by Ar ^X2 in X) and at least one divalent heterocyclic group are directly bonded.

Ar ² and Ar ⁴ are preferably arylene groups which may have a substituent, because the initial deterioration of the light emitting device according to the present embodiment is suppressed.

The definition and the example of the arylene group represented by Ar ² and Ar ⁴ are the same as the definition and the example of the arylene group represented by Ar ^X1 and Ar ^X3 in Formula (X) described above.

The definition and examples of the divalent heterocyclic group represented by Ar ² and Ar ⁴ are the same as the definitions and examples of the divalent heterocyclic group represented by Ar ^X1 and Ar ^X3 in the above-mentioned formula (X) is there.

The group represented by Ar ² , Ar ³ and Ar ⁴ may have a substituent, and as the substituent, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, A fluorine atom, a monovalent heterocyclic group and a cyano group can be mentioned.

The definitions and examples of the alkylene group, cycloalkylene group, arylene group and divalent heterocyclic group represented by K ^A are respectively the alkylene group, cycloalkylene group, arylene group and divalent hetero group represented by L ^A The same as the definition and examples of the ring group.

K ^A is preferably a phenylene group or an alkylene group because K ^A facilitates the synthesis of the polymer compound of the hole transport layer, and these groups may have a substituent.

  The definition and the example of the crosslinking group represented by X 'are the same as the definition and the example of the crosslinking group represented by X described above.

  The structural unit represented by the formula (4) is preferably 1 for the total amount of structural units contained in the polymer compound of the hole transport layer, since the crosslinkability of the polymer compound of the hole transport layer is excellent. It is -90 mol%, more preferably 3 to 50 mol%, still more preferably 5 to 20 mol%.

  The constituent unit represented by the formula (4) may be contained only one kind or two or more kinds in the polymer compound of the hole transport layer.

  As a structural unit represented by Formula (3), the structural unit represented by Formula (3-1)-Formula (3-30) is mentioned, for example, As a structural unit represented by Formula (4) For example, the structural unit represented by Formula (4-1)-Formula (4-9) is mentioned. Among these, since the crosslinkability of the polymer compound of the hole transport layer is excellent, it is preferably a structural unit represented by formula (3-1) to formula (3-30), and more preferably 3-1) to formula (3-15), formula (3-19), formula (3-20), formula (3-23), formula (3-25) or formula (3-30) It is a constitutional unit, more preferably a constitutional unit represented by formula (3-1) to formula (3-13) or formula (3-30), particularly preferably a formula (3-1) to formula (3-9) or a structural unit represented by formula (3-30).

［式中、Ａｒ^Ｙ１は、アリーレン基、２価の複素環基、又は、少なくとも１種のアリーレン基と少なくとも１種の２価の複素環基とが直接結合した２価の基を表し、これらの基は置換基を有していてもよい。］

[ ^Wherein , Ar ^{Y 1} represents an arylene group, a divalent heterocyclic group, or a divalent group in which at least one arylene group and at least one type of divalent heterocyclic group are directly bonded, Groups may have a substituent. ]

The arylene group represented by Ar ^Y1 is more preferably a group represented by the formula (A-1), a formula (A-2), a formula (A-6)-(A-10), a formula (A-19) or a formula (A-19) A-20) A group represented by A-20), and more preferably, Formula (A-1), Formula (A-2), Formula (A-7), Formula (A-9) or Formula (A-19) And these groups may have a substituent.

The divalent heterocyclic group represented by Ar ^Y1 is more preferably represented by the formula (AA-1)-(AA-4), the formula (AA-10)-(AA-15), the formula (AA-18) -(AA-21), a group represented by the formula (AA-33) or the formula (AA-34), more preferably a group represented by the formula (AA-4), the formula (AA-10) or the formula (AA-) 12) groups represented by formula (AA-14) or formula (AA-33), and these groups may have a substituent.

More preferable range of an arylene group and a divalent heterocyclic group in a divalent group in which at least one arylene group represented by Ar ^Y1 and at least one divalent heterocyclic group are directly bonded, further preferable The ranges are respectively the same as the more preferable range and the further preferable range of the arylene group and the divalent heterocyclic group represented by Ar ^Y1 described above.

  Examples of “a divalent group in which at least one arylene group and at least one divalent heterocyclic group are directly bonded” include groups represented by the following formulas, and these groups have a substituent It may be done.

［式中、Ｒ^ＸＸは、水素原子、アルキル基、シクロアルキル基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。］

[Wherein, R ^XX represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]

R ^XX is preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent.

The substituent which the group represented by Ar ^Y1 may have is preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups may further have a substituent.

  Examples of the structural unit represented by the formula (Y) include structural units represented by the formulas (Y-1) to (Y-10), and from the viewpoint of the initial deterioration of the light emitting device according to the present embodiment. Is preferably a structural unit represented by the formula (Y-1)-(Y-3), and from the viewpoint of the hole transportability, it is preferably a table represented by the formula (Y-8)-(Y-10) Structural unit.

［式中、Ｒ^Ｙ１は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｙ１は、同一でも異なっていてもよく、隣接するＲ^Ｙ１同士は互いに結合して、それぞれが結合する炭素原子と共に環を形成していてもよい。］

[Wherein, R ^Y1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent] . Plural R ^Y1 may be the same or different, and adjacent R ^Y1 may be bonded to each other to form a ring together with the carbon atoms to which they are bonded. ]

R ^Y1 is preferably a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent.

  The structural unit represented by formula (Y-1) is preferably a structural unit represented by formula (Y-1 ').

［式中、Ｒ^Ｙ１１は、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｙ１１は、同一でも異なっていてもよい。］

[Wherein, R ^Y11 represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. Plural R ^Y11 may be the same or different. ]

R ^Y11 is preferably an alkyl group, a cycloalkyl group or an aryl group, more preferably an alkyl group or a cycloalkyl group, and these groups may have a substituent.

［式中、Ｒ^Ｙ１は前記と同じ意味を表す。Ｘ^Ｙ１は、−Ｃ（Ｒ^Ｙ２）_２−、−Ｃ（Ｒ^Ｙ２）＝Ｃ（Ｒ^Ｙ２）−又は−Ｃ（Ｒ^Ｙ２）_２−Ｃ（Ｒ^Ｙ２）_２−で表される基を表す。Ｒ^Ｙ２は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。複数存在するＲ^Ｙ２は、同一でも異なっていてもよく、Ｒ^Ｙ２同士は互いに結合して、それぞれが結合する炭素原子と共に環を形成していてもよい。］

[Wherein, R ^Y1 represents the same meaning as described above. X ^Y1 represents a group represented by —C (R ^Y2 ) ₂ —, —C (R ^Y2 ) = C (R ^Y2 ) — or —C (R ^Y2 ) ₂ —C (R ^Y2 ) ₂ —. R ^Y2 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. A plurality of R ^Y2 may be the same or different, and R ^Y2 may be bonded to each other to form a ring together with the carbon atoms to which they are bonded. ]

R ^Y2 is preferably an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, more preferably an alkyl group, a cycloalkyl group or an aryl group, and these groups have a substituent It may be done.

In X ^Y1 , the combination of two R ^{Y2 in} the group represented by —C (R ^Y2 ) ₂ — is preferably both an alkyl group or a cycloalkyl group, both an aryl group, and both of which are monovalent A ring group, or one of which is an alkyl group or a cycloalkyl group and the other is an aryl group or a monovalent heterocyclic group, more preferably one of which is an alkyl group or a cycloalkyl group and the other of which is an aryl group; May have a substituent. Two R ^Y2 may be bonded to each other to form a ring together with the atoms to which each is bonded, and when R ^Y2 forms a ring, the group represented by —C (R ^Y2 ) ₂ — Is preferably a group represented by the formula (Y-A1)-(Y-A5), more preferably a group represented by the formula (Y-A4), and these groups have a substituent It may be

In X ^Y1 , the combination of two R ^{Y2 in} a group represented by —C (R ^Y2 ) = C (R ^Y2 ) — is preferably both an alkyl group or a cycloalkyl group, or one of which is an alkyl group. Or a cycloalkyl group and the other is an aryl group, and these groups may have a substituent.

In R ^Y1 , four R ^Y2 in the group represented by —C (R ^Y2 ) ₂ —C (R ^Y2 ) ₂ — are preferably an alkyl group or a cycloalkyl group which may have a substituent. It is. A plurality of R ^Y2 may be bonded to each other to form a ring together with the atoms to which each is attached, and in the case where R ^Y2 forms a ring, -C (R ^Y2 ) ₂ -C (R ^Y2 ) _2- The group represented is preferably a group represented by the formula (Y-B1)-(Y-B5), more preferably a group represented by the formula (Y-B3), and these groups are substituted It may have a group.

［式中、Ｒ^Ｙ２は前記と同じ意味を表す。］

[Wherein, R ^Y2 represents the same meaning as described above. ]

  It is preferable that the structural unit represented by Formula (Y-2) is a structural unit represented by Formula (Y-2 ').

［式中、Ｒ^Ｙ１及びＸ^Ｙ１は前記と同じ意味を表す。］

[Wherein, R ^Y1 and X ^Y1 represent the same meaning as described above. ]

［式中、Ｒ^Ｙ１及びＸ^Ｙ１は前記と同じ意味を表す。］

[Wherein, R ^Y1 and X ^Y1 represent the same meaning as described above. ]

  The structural unit represented by the formula (Y-3) is preferably a structural unit represented by the formula (Y-3 ').

［式中、Ｒ^Ｙ１１及びＸ^Ｙ１は前記と同じ意味を表す。］

[Wherein, R ^Y11 and X ^Y1 represent the same meaning as described above. ]

［式中、Ｒ^Ｙ１は前記と同じ意味を表す。Ｒ^Ｙ３は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。］

[Wherein, R ^Y1 represents the same meaning as described above. R ^Y3 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]

R ^Y3 is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups have a substituent May be

  The structural unit represented by the formula (Y-4) is preferably a structural unit represented by the formula (Y-4 ′), and the structural unit represented by the formula (Y-6) is a compound represented by the formula (Y) It is preferable that it is a structural unit represented by -6 '.

［式中、Ｒ^Ｙ１及びＲ^Ｙ３は前記と同じ意味を表す。］

[Wherein, R ^Y1 and R ^Y3 represent the same meaning as described above. ]

［式中、Ｒ^Ｙ１は前記を同じ意味を表す。Ｒ^Ｙ４は、水素原子、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリール基又は１価の複素環基を表し、これらの基は置換基を有していてもよい。］

[Wherein, R ^Y1 represents the same meaning as described above. R ^Y4 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]

R ^Y4 is preferably an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, more preferably an aryl group, and these groups have a substituent May be

  As the structural unit represented by the formula (Y), for example, a structural unit consisting of an arylene group represented by the formulas (Y-101) to the formula (Y-121), a formula (Y-201) to a formula (Y-) Constituent unit comprising a divalent heterocyclic group represented by 206), at least one arylene group represented by formulas (Y-300) to (Y-304) and at least one divalent heterocyclic ring The structural unit consisting of a divalent group to which a group is directly bonded is mentioned, and preferably, a structural unit consisting of an arylene group represented by the formula (Y-101) to the formula (Y-121), a formula (Y-201) ) To a constituent unit comprising a divalent heterocyclic group represented by the formula (Y-206), at least one arylene group represented by the formula (Y-301) to the formula (Y-304), and at least one member And a divalent heterocyclic group directly bonded to the divalent heterocyclic group.

The structural unit represented by the formula (Y), in which Ar ^{Y 1} is an arylene group, further suppresses the initial deterioration of the light emitting device according to the present embodiment, so the polymer compound of the hole transport layer Preferably it is 0.5-90 mol%, More preferably, it is 30-80 mol% with respect to the total amount of the structural unit contained in these.

A constituent unit represented by the formula (Y), wherein Ar ^{Y 1} is a divalent heterocyclic group, or a bivalent in which at least one arylene group and at least one divalent heterocyclic group are directly bonded. The structural unit which is a group of the above is preferably 0.5 based on the total amount of structural units contained in the polymer compound of the hole transport layer, because the hole transportability of the polymer compound of the hole transport layer is excellent. It is 40 to 40 mol%, more preferably 3 to 30 mol%.

  The constituent unit represented by the formula (Y) may be contained only one kind or two or more kinds in the polymer compound of the hole transport layer.

  When the light emitting device according to this embodiment has an electron transport layer, the electron transport material contained in the electron transport layer is represented by the structural unit represented by formula (ET-1) and the formula (ET-2) Polymer compounds containing at least one structural unit selected from the group consisting of structural units (hereinafter also referred to as “polymer compound for electron transport layer”) are preferable.

［式中、
ｎＥ１は、１以上の整数を表す。
Ａｒ^Ｅ１は、芳香族炭化水素基又は複素環基を表し、これらの基はＲ^Ｅ１以外の置換基を有していてもよい。
Ｒ^Ｅ１は、式（ＥＳ−１）で表される基を表す。Ｒ^Ｅ１が複数存在する場合、それらは同一でも異なっていてもよい。］

[In the formula,
nE1 represents an integer of 1 or more.
Ar ^E1 represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent other than R ^E1 .
R ^E1 represents a group represented by the formula (ES-1). When a plurality of R ^E1 are present, they may be the same or different. ]

-R ^E3 -{(Q ^E1 ) _n ^E3- Y ^E1 (M ^E1 ) _aE1 (Z ^E1 ) _b ^E1 } _mE1 (ES-1)
[In the formula,
nE3 represents an integer of 0 or more, aE1 represents an integer of 1 or more, bE1 represents an integer of 0 or more, and mE1 represents an integer of 1 or more. When two or more nE3, aE1 and bE1 exist, they may be the same or different. However, mE1 is 1 when R ^E3 is a single bond. Further, aE1 and bE1 are selected such that the charge of the group represented by formula (ES-1) is zero.
R ^E3 represents a single bond, a hydrocarbon group, a heterocyclic group or -O-R ^E3 '(R ^E3 ' represents a hydrocarbon group or a heterocyclic group), and these groups have a substituent It may be
Q ^E1 represents an alkylene group, a cycloalkylene group, an arylene group, an oxygen atom or a sulfur atom, and these groups may have a substituent. When a plurality of Q ^E1 are present, they may be the same or different.
Y ^{E1 _{is, -CO 2 -, -SO 3 -}} , -SO 2 - represents a ^2- or _-PO ^3. When a plurality of Y ^E1 are present, they may be the same or different.
M ^E1 represents an alkali metal cation, an alkaline earth metal cation or an ammonium cation, and the ammonium cation may have a substituent. When a plurality of M ^E1 are present, they may be the same or different.
Z ^E1 is F ⁻ , OH ⁻ , B (R ^E4 ) ₄ ⁻ , R ^E4 SO ₃ ⁻ , R ^E4 COO ⁻ , NO ₃ ⁻ , SO ₄ ²⁻ , HSO ₄ ⁻ , PO ₄ ³⁻ , HPO ₄ ^{2 _{-, H 2 PO 4 -,}} BF 4 - or PF ₆ ^- represents a. R ^E4 represents an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. When a plurality of Z ^E1 are present, they may be the same or different. ]

  nE1 is usually an integer of 1 to 4, preferably 1 or 2.

The aromatic hydrocarbon group or heterocyclic group represented by Ar ^E1 is 1,4-phenylene group, 1,3-phenylene group, 1,2-phenylene group, 2,6-naphthalenediyl group, 1,4 A hydrogen directly bonded to a ring atom from a naphthalenediyl group, a 2,7-fluorenedyl group, a 3,6-fluorenedyl group, a 2,7-phenanthrendiyl group or a 2,7-carbazolediyl group The group except the atom nE1 is preferable, and may have a substituent other than R ^E1 .

As a substituent other than R ^E1 which Ar ^E1 may have, a fluorine atom, a cyano group, an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group, an alkoxy group, a cycloalkoxy group, an aryloxy A group, an amino group, a substituted amino group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a cycloalkynyl group, a carboxyl group and a group represented by the formula (ES-3) can be mentioned.

-O- (C _{n '} H _{2 n'} O) _nx- C _{m '} H _{2 m' + 1} (ES-3)
[Wherein, n ′, m ′ and nx each independently represent an integer of 1 or more. ]

  nE3 is usually an integer of 0 to 10, preferably an integer of 0 to 8, and more preferably an integer of 0 to 2.

  aE1 is usually an integer of 1 to 10, preferably an integer of 1 to 5, and more preferably 1 or 2.

  bE1 is usually an integer of 0 to 10, preferably an integer of 0 to 4, and more preferably 0 or 1.

  mE1 is usually an integer of 1 to 5, preferably 1 or 2, and more preferably 1.

When R ^E3 is —O—R ^E3 ′, the group represented by the formula (ES-1) is a group represented by the following formula.
_{^{-O-R E3 '- {(}} Q E1) nE3 -Y E1 (M E1) aE1 (Z E1) bE1} mE1

As R ^E3 , a hydrocarbon group or a heterocyclic group is preferable, an aromatic hydrocarbon group or an aromatic heterocyclic group is more preferable, and an aromatic hydrocarbon group is more preferable.

^Examples of the substituent which R ^E3 may have include an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group and a group represented by the formula (ES-3), and The group represented by 3) is preferable.

As Q ^E1 , an alkylene group, an arylene group or an oxygen atom is preferable, and an alkylene group or an oxygen atom is more preferable.

The _{^{Y E1, -CO 2 -, -SO}} 2 - or _PO ^{3 2-is} preferable, -CO ₂ ^- is more preferable.

Examples of the alkali metal cation represented by M ^E1, for ^{example, Li +, Na +, K} +, Rb +, Cs + are ^mentioned, K ^+, Rb + or Cs ⁺ is preferred, Cs ⁺ is more preferable.

Examples of the alkaline earth metal cation represented by M ^E1, for ^{example, Be 2+, Mg 2+, Ca} 2+, Sr 2+, Ba 2+ are ^{mentioned, Mg 2+, Ca 2+, Sr} 2+ or ^{Ba 2+} is preferably, ^{Ba 2+} Is more preferred.

As M ^E1 , an alkali metal cation or an alkaline earth metal cation is preferable, and an alkali metal cation is more preferable.

As Z ^E1 , F ⁻ , OH ⁻ , B (R ^E4 ) ₄ ⁻ , R ^E4 SO ₃ ⁻ , R ^E4 COO ⁻ or NO ₃ ⁻ is preferable, and F ⁻ , OH ⁻ , R ^E4 SO ₃ ⁻ or R ^E4 is preferable. COO ^- is preferable. As R ^E4 , an alkyl group is preferable.

  As a group represented by Formula (ES-1), the group represented by a following formula is mentioned, for example.

［式中、Ｍ^＋は、Ｌｉ^＋、Ｎａ^＋、Ｋ^＋、Ｃｓ^＋又はＮ（ＣＨ_３）_４ ^＋を表す。Ｍ^＋が複数存在する場合、それらは同一でも異なっていてもよい。］

[Wherein, M ⁺ represents Li ⁺ , Na ⁺ , K ⁺ , Cs ⁺ or N (CH ₃ ) ₄ ⁺ . When a plurality of M ⁺ are present, they may be the same or different. ]

［式中、
ｎＥ２は、１以上の整数を表す。
Ａｒ^Ｅ２は、芳香族炭化水素基又は複素環基を表し、これらの基はＲ^Ｅ２以外の置換基を有していてもよい。
Ｒ^Ｅ２は、式（ＥＳ−２）で表される基を表す。Ｒ^Ｅ２が複数存在する場合、それらは同一でも異なっていてもよい。］

[In the formula,
nE2 represents an integer of 1 or more.
Ar ^E2 represents an aromatic hydrocarbon group or a heterocyclic group, and these groups may have a substituent other than R ^E2 .
R ^E2 represents a group represented by the formula (ES-2). When two or more R ^E2 are present, they may be the same or different. ]

-R ^E5 -{(Q ^E2 ) _{n E4-} Y ^E2 (M ^E2 ) _aE2 (Z ^E2 ) _b ^E2 } _mE2 (ES-2)
[In the formula,
nE4 represents an integer of 0 or more, aE2 represents an integer of 1 or more, bE2 represents an integer of 0 or more, and mE2 represents an integer of 1 or more. When a plurality of nE4, aE2 and bE2 are present, they may be the same or different. However, mE2 is 1 when R ^E5 is a single bond. Further, aE2 and bE2 are selected such that the charge of the group represented by formula (ES-2) is zero.
R ^E5 represents a single bond, a hydrocarbon group, a heterocyclic group or -O-R ^E5 '(R ^E5 ' represents a hydrocarbon group or a heterocyclic group), and these groups have a substituent It may be
Q ^E2 represents an alkylene group, a cycloalkylene group, an arylene group, an oxygen atom or a sulfur atom, and these groups may have a substituent. When two or more Q ^E2 are present, they may be the same or different.
Y ^{E2 represents _{-C + R E6 2, -N +}} R E6 3, -P + R E6 3, -S + R E6 2 or ^-I + ^{R E6} _2. R ^E6 represents a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. Plural R ^E6 may be the same or different. When a plurality of Y ^E2 are present, they may be the same or different.
M ^E2 represents F ⁻ , OH ⁻ , B (R ^E7 ) ₄ ⁻ , R ^E7 SO ₃ ⁻ , R ^E7 COO ⁻ , BF ₄ ⁻ , or SbF ₆ ⁻ . R ^E7 represents an alkyl group, a cycloalkyl group or an aryl group, and these groups may have a substituent. When two or more M ^E2 are present, they may be the same or different.
Z ^E2 represents an alkali metal cation or an alkaline earth metal cation. When a plurality of Z ^E2 are present, they may be the same or different. ]

  nE2 is usually an integer of 1 to 4, preferably 1 or 2.

As an aromatic hydrocarbon group or heterocyclic group represented by Ar ^E2 , a 1,4-phenylene group, a 1,3-phenylene group, a 1,2-phenylene group, a 2,6-naphthalenediyl group, a 1,4 phenylene group, A hydrogen directly bonded to an atom constituting a ring from a naphthalenediyl group, 2,7-fluorenedyl group, 3,6-fluorenedyl group, 2,7-phenanthrenyl group or 2,7-carbazolediyl group The group except the atom nE2 is preferable, and may have a substituent other than R ^E2 .

The substituent other than R ^E2 which may be possessed by Ar ^E2 is the same as the substituent other than R ^E1 which may be possessed by Ar ^E1 .

  nE 4 is usually an integer of 0 to 10, preferably an integer of 0 to 8, and more preferably an integer of 0 to 2.

  aE2 is usually an integer of 1 to 10, preferably an integer of 1 to 5, and more preferably 1 or 2.

  bE2 is usually an integer of 0 to 10, preferably an integer of 0 to 4, and more preferably 0 or 1.

  mE2 is usually an integer of 1 to 5, preferably 1 or 2, and more preferably 1.

When R ^E5 is —O—R ^E5 ′, the group represented by formula (ES-2) is a group represented by the following formula.
_{^{-O-R E5 '- {(}} Q E1) nE3 -Y E1 (M E1) aE1 (Z E1) bE1} mE1

As R ^E5 , a hydrocarbon group or a heterocyclic group is preferable, an aromatic hydrocarbon group or an aromatic heterocyclic group is more preferable, and an aromatic hydrocarbon group is more preferable.

^Examples of the substituent which may be possessed by R ^E5 include an alkyl group, a cycloalkyl group, an aryl group, a monovalent heterocyclic group and a group represented by the formula (ES-3). The group represented by 3) is preferable.

As Q ^E2 , an alkylene group, an arylene group or an oxygen atom is preferable, and an alkylene group or an oxygen atom is more preferable.

The _{^{Y E2, -C + R E6 2}} , -N + R E6 3, preferably -P ^{+ R E6} ₃ or _{^{-S + R E6 2, -N +}} R E6 3 is more preferable. As R ^E6 , a hydrogen atom, an alkyl group or an aryl group is preferable, and a hydrogen atom or an alkyl group is more preferable.

As M ^E2 , F ⁻ , B (R ^E7 ) ₄ ⁻ , R ^E7 SO ₃ ⁻ , R ^E7 COO ⁻ , BF ₄ ⁻ or SbF ^{6 −} is preferable, and B (R ^E7 ) ₄ ⁻ , R ^E7 COO ⁻ or SbF ^6- is more preferred. As R ^E7 , an alkyl group is preferable.

Examples of the alkali metal cation represented by Z ^E2 include Li ⁺ , Na ⁺ , K ⁺ , Rb ⁺ and Cs ⁺ , and Li ⁺ , Na ⁺ or K ⁺ is preferable.

Examples of the alkaline earth metal cation represented by Z ^E2 include Be ²⁺ , Mg ²⁺ , Ca ²⁺ , Sr ²⁺ and Ba ²⁺ , with Mg ²⁺ or Ca ²⁺ being preferred.

As Z ^E2 , an alkali metal cation is preferable.

  As a group represented by Formula (ES-2), the group represented by a following formula is mentioned, for example.

［式中、Ｘ⁻は、Ｆ⁻、Ｂ（Ｃ_６Ｈ_５）_４ ⁻、ＣＨ_３ＣＯＯ⁻又はＣＦ_３ＳＯ_３ ⁻を表す。Ｘ⁻が複数存在する場合、それらは同一でも異なっていてもよい。］

Wherein, X ^{- _{is, F -, B (C 6}} H 5) 4 -, CH 3 COO - or _CF 3 SO ₃ ^- represents a. When a plurality of X ^- are present, they may be the same or different. ]

  As a structural unit represented by Formula (ET-1) and Formula (ET-2), the structural unit represented by following formula (ET-31)-Formula (ET-38) is mentioned, for example.

  The polymer compound of the electron transport layer is, for example, disclosed in JP-A-2009-239279, JP-A-2012-033845, JP-A-2012-216821, JP-A-2012-216822, JP-A-2012-216815. It can synthesize | combine according to the method as described in these.

  The material of the hole transport layer, the material of the electron transport layer and the material of the light emitting layer are respectively used in the solvent used in forming the hole transport layer, the electron transport layer and the layer adjacent to the light emitting layer in the preparation of the light emitting device. When dissolving, it is preferable that the material has a crosslinking group in order to avoid dissolving the material in the solvent. After each layer is formed using a material having a crosslinking group, the layer can be insolubilized by crosslinking the crosslinking group.

  In the light emitting device according to this embodiment, as a method of forming each layer such as a light emitting layer, a hole transporting layer, an electron transporting layer, a hole injecting layer, an electron injecting layer and the like, when using a low molecular weight compound, for example, A vacuum vapor deposition method, a method by film formation from a solution or molten state may be mentioned, and when using a polymer compound, for example, a method by film formation from a solution or molten state may be mentioned.

  The order, number and thickness of layers to be stacked are adjusted in consideration of external quantum efficiency and luminance lifetime.

[Substrate / electrode]
The substrate in the light emitting element may be any substrate that can form an electrode and does not change chemically when forming an organic layer, and is, for example, a substrate made of a material such as glass, plastic, or silicon. In the case of an opaque substrate, it is preferred that the electrode furthest from the substrate be transparent or translucent.

  Examples of the material of the anode include conductive metal oxides and semitransparent metals, preferably indium oxide, zinc oxide, tin oxide; indium tin oxide (ITO), indium zinc oxide, etc. Conductive compounds; complexes of silver, palladium and copper (APC); NESA, gold, platinum, silver, copper.

The material of the cathode includes, for example, metals such as lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, aluminum, zinc and indium; alloys of two or more of them; one of them And alloys thereof with one or more species of silver, copper, manganese, titanium, cobalt, nickel, tungsten, and tin; and graphite and graphite intercalation compounds. Examples of the alloy include magnesium-silver alloy, magnesium-indium alloy, magnesium-aluminum alloy, indium-silver alloy, lithium-aluminum alloy, lithium-magnesium alloy, lithium-indium alloy, and calcium-aluminum alloy.
The anode and the cathode may each have a laminated structure of two or more layers.

[Use]
In order to obtain planar light emission using a light emitting element, a planar anode and a cathode may be arranged to overlap. In order to obtain pattern-like light emission, a method of installing a mask provided with a pattern-like window on the surface of a planar light-emitting element is used. There is a method, a method of forming an anode or a cathode, or both electrodes in a pattern. By forming a pattern by any of these methods and arranging so that several electrodes can be turned ON / OFF independently, a segment type display device capable of displaying numbers, characters, etc. can be obtained. In order to obtain a dot matrix display device, both the anode and the cathode may be formed in stripes and arranged orthogonal to each other. Partial color display and multi-color display can be performed by a method of separately coating a plurality of types of polymer compounds different in emission color and a method of using a color filter or a fluorescence conversion filter. The dot matrix display device can be driven passively, or can be driven active in combination with a TFT or the like. These display devices can be used as displays of computers, televisions, portable terminals, and the like. A planar light emitting element can be suitably used as a planar light source for backlight of a liquid crystal display device or a planar light source for illumination. If a flexible substrate is used, it can also be used as a curved light source and display device.

  As mentioned above, although one preferable embodiment of this invention was described, this invention is not limited to said embodiment.

For example, one aspect of the present invention may relate to a composition in which a phosphorescent compound represented by Formula (1) having a residual chlorine concentration of 15 mass ppm or less and a host material are blended. The residual chlorine concentration of the phosphorescent compound is the same as the amount (C ₁ ) of chlorine atoms contained in the phosphorescent compound represented by the formula (1).

In one embodiment, the residual chlorine concentration of the phosphorescent compound is C ₁ (ppm), and the ratio (mass ratio) of the compounding amount of the phosphorescent compound to the total amount of solid content mixed in the composition is W ₁ Sometimes, the composition may satisfy the following formula (i).
C ₁ × W ₁ ≦ 3.5 (i)

In one embodiment, when the residual chlorine concentration of the host material is C ₂ (mass ppm) and the ratio (mass ratio) of the blending amount of the host material to the total amount of solid content blended in the composition is W ₂ , The composition may satisfy the following formula (ii).
C ₁ × W ₁ + C ₂ × W ₂ ≦ 3.5 (ii)

  Further, according to one aspect of the present invention, there is provided a process of preparing a crude purified product of the phosphorescent compound represented by the formula (1) having a residual chlorine concentration exceeding 15 mass ppm, and a crude chlorine having a residual chlorine concentration of 15 The method may be directed to a method of purifying a composition, comprising the steps of: obtaining a purified product of a phosphorescent compound at a mass ppm or less; and obtaining a composition containing the purified product and a host material.

  Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

  In Examples, the polystyrene equivalent number average molecular weight (Mn) of the polymer compound and the polystyrene equivalent weight average molecular weight (Mw) were determined by the following size exclusion chromatography (SEC) using tetrahydrofuran as the mobile phase . The SEC measurement conditions are as follows.

  The polymer compound to be measured was dissolved in tetrahydrofuran at a concentration of about 0.05% by mass, and 10 μL was injected into SEC. The mobile phase flowed at a flow rate of 2.0 mL / min. PLgel MIXED-B (manufactured by Polymer Laboratories) was used as a column. As a detector, a UV-VIS detector (manufactured by Shimadzu Corporation, trade name: SPD-10Avp) was used.

LC-MS was measured by the following method.
The measurement sample was dissolved in chloroform or tetrahydrofuran to a concentration of about 2 mg / mL, and about 1 μL was injected into LC-MS (manufactured by Agilent, trade name: 1100 L CMSD). The mobile phase of LC-MS was used while changing the ratio of acetonitrile and tetrahydrofuran, and flowed at a flow rate of 0.2 mL / min. The column used was L-column 2 ODS (3 μm) (manufactured by Chemical Evaluation and Research Organization, inner diameter: 2.1 mm, length: 100 mm, particle diameter 3 μm).

TLC-MS was measured by the following method.
The measurement sample is dissolved in any solvent of toluene, tetrahydrofuran or chloroform at an arbitrary concentration, and coated on a TLC plate for DART (trade name: YSK5-100 manufactured by Techno Applications, Inc.), and TLC-MS (Nihon Denshi Co., Ltd.) And brand name: JMS-T100TD (The AccuTOF TLC). The helium gas temperature at the time of measurement was adjusted in the range of 200 to 400.degree.

NMR was measured by the following method.
About 5 to 10 mg of a measurement sample, about 0.5 mL of heavy chloroform (CDCl ₃ ), heavy tetrahydrofuran, heavy dimethyl sulfoxide, heavy acetone, heavy N, N-dimethylformamide, heavy toluene, heavy methanol, heavy ethanol, heavy 2-propanol Alternatively, it was dissolved in methylene dichloride and measured using an NMR apparatus (manufactured by Agilent, trade name: INOVA 300 or MERCURY 400 VX).

  The value of high performance liquid chromatography (HPLC) area percentage was used as an index of compound purity. Unless otherwise indicated, this value is a value at UV = 254 nm in HPLC (manufactured by Shimadzu Corporation, trade name: LC-20A). At this time, the compound to be measured was dissolved in tetrahydrofuran or chloroform so as to have a concentration of 0.01 to 0.2% by mass, and 1 to 10 μL was injected into HPLC according to the concentration. The mobile phase of HPLC was used at a flow rate of 1.0 mL / min, with the ratio of acetonitrile / tetrahydrofuran being changed from 100/0 to 0/100 (volume ratio). As a column, an ODS column having Kaseisorb LC ODS 2000 (manufactured by Tokyo Chemical Industry Co., Ltd.) or the like was used. As a detector, a photodiode array detector (manufactured by Shimadzu Corporation, trade name: SPD-M20A) was used.

In the present example, the maximum peak wavelength of the emission spectrum of the phosphorescent compound was measured at room temperature by a spectrophotometer (FP-6500, manufactured by JASCO Corporation). A xylene solution in which the phosphorescent compound was dissolved in xylene at a concentration of about 0.8 × 10 ⁻⁴ mass% was used as a sample. As excitation light, UV light of wavelength 325 nm was used.

  The amount of bromine atoms and the amount of chlorine atoms contained in the phosphorescent compound and the host material were measured by an automatic combustion-ion chromatography method. In this measurement, combustion decomposition was performed using an automatic sample combustion apparatus AQF-2100H type manufactured by Mitsubishi Chemical Analytech Co., Ltd., and subsequent ion chromatography was performed using an ion chromatography system ICS-2100 manufactured by Thermo Fisher Scientific Co., Ltd. .

Synthesis Example 1 Synthesis of Compound M1, Compound M2, and Compound M3 Compound M1 was synthesized according to the method described in WO 2015/145871.
Compound M2 was synthesized according to the method described in WO 2013/146806.
Compound M3 was synthesized according to the method described in WO 2005/049546.

Synthesis Example 2 Synthesis of Polymer Compound HTL-1 (Step 1) After setting the inside of a reaction vessel to an inert gas atmosphere, Compound M1 (0.923 g), Compound M2 (0.0496 g), Compound M3 (0. 917 g), dichlorobis (tris-o-methoxyphenylphosphine) palladium (1.76 mg) and toluene (34 mL) were added and heated to 105 ° C.
(Step 2) A 20% by mass tetraethylammonium hydroxide aqueous solution (6.7 mL) was added dropwise to the reaction mixture, and the mixture was refluxed for 6 hours.
(Step 3) After the reaction, phenylboronic acid (48.8 mg) and dichlorobis (tris-o-methoxyphenylphosphine) palladium (0.88 mg) were added thereto, and the mixture was refluxed for 14.5 hours.
(Step 4) Thereafter, an aqueous solution of sodium diethyldithiacarbamate was added thereto, and the mixture was stirred at 80 ° C. for 2 hours. After cooling, the resulting reaction solution was washed twice with water, twice with a 3% by mass aqueous acetic acid solution, and twice with water, and the resulting solution was added dropwise to methanol, whereby a precipitate formed. The resulting precipitate was dissolved in toluene and purified by passing through an alumina column and a silica gel column in this order. The obtained solution was added dropwise to methanol and stirred, and then the obtained precipitate was collected by filtration and dried to obtain 1.23 g of a polymer compound HTL-1.

The polystyrene equivalent number average molecular weight of the polymer compound HTL-1 was 2.3 × 10 ⁴ , and the polystyrene equivalent weight average molecular weight was 1.2 × 10 ⁵ .

  The polymer compound HTL-1 has a structural unit derived from the compound M1, a structural unit derived from the compound M2, and a structural unit derived from the compound M3 in the theoretical value determined from the amount of the raw materials charged. It is a copolymer comprised by the molar ratio of 45: 5: 50.

Synthesis Example 3 Synthesis of Compound M4 and Compound M5 Compound M4 was synthesized according to the method described in JP 2012-33845A.
Compound M5 was synthesized according to the method described in JP-A-2010-189630.

Synthesis Example 4 Synthesis of Polymer Compound ET1 (Step 1) After setting the inside of the reaction vessel to an inert gas atmosphere, Compound M4 (9.23 g), Compound M5 (4.58 g), dichlorobis (tris-o-methoxy) Phenylphosphine) palladium (8.6 mg), methyltrioctylammonium chloride (manufactured by Sigma-Aldrich, trade name Aliquat 336 (registered trademark)) (0.098 g) and toluene (175 mL) were added and heated to 105 ° C.
(Step 2) After that, a 12 mass% aqueous solution of sodium carbonate (40.3 mL) was added dropwise thereto, and the mixture was refluxed for 29 hours.
(Step 3) Thereafter, phenylboronic acid (0.47 g) and dichlorobis (tris-o-methoxyphenylphosphine) palladium (8.7 mg) were added thereto, and refluxed for 14 hours.
(Step 4) Thereafter, an aqueous solution of sodium diethyldithiacarbamate was added thereto, and the mixture was stirred at 80 ° C. for 2 hours. After cooling the obtained reaction solution, it was added dropwise to methanol, whereby precipitation occurred. The precipitate was collected by filtration, washed with methanol and water, and dried, and the resulting solid was dissolved in chloroform, and purified by passing sequentially through an alumina column and a silica gel column in which chloroform was passed in advance. The resulting purified solution was added dropwise to methanol and stirred, whereupon a precipitate formed. The precipitate was collected by filtration and dried to give polymer compound ET1a (7.15 g). The Mn of the polymer compound ET1a was 3.2 × 10 ⁴ , and the Mw thereof was 6.0 × 10 ⁴ .
The polymer compound ET1a has a theoretical value determined from the amount of the raw materials, in which the structural unit derived from the compound M4 and the structural unit derived from the compound M5 are formed at a molar ratio of 50:50. It is a polymer.
(Step 5) After making the inside of the reaction vessel under an argon gas atmosphere, polymer compound ET1a (3.1 g), tetrahydrofuran (130 mL), methanol (66 mL), cesium hydroxide monohydrate (2.1 g) and water (12.5 mL) was added and stirred at 60 ° C. for 3 hours.
(Step 6) Thereafter, methanol (220 mL) was added thereto, and stirred for 2 hours. The resulting reaction mixture was concentrated and then added dropwise to isopropyl alcohol and stirred, whereupon a precipitate formed. The precipitate was collected by filtration and dried to give polymer compound ET1 (3.5 g). By ¹ H-NMR analysis of the polymer compound ET1, it was confirmed that the signal of the ethyl ester site in the polymer compound ET1 disappeared and the reaction was completed.
In the theoretical value of the polymer compound ET1 determined from the amount of the raw materials charged for the polymer compound ET1a, the structural unit represented by the following formula and the structural unit derived from the compound M5 have a molar ratio of 50:50 It is a copolymer comprised.

  Elemental analysis values of the polymer compound ET1 are C, 54.1% by mass; H, 5.6% by mass; N, <0.3% by mass; Cs, 22.7% by mass (theoretical value: C, 57. H, 5.70 mass%; Cs, 21.49 mass%; O, 15.52 mass%).

Synthesis Example 5 Synthesis of Compound HM-1

  After making the inside of the reaction vessel into a nitrogen gas atmosphere, compound HM-1a (324 g), compound HM-1b (300 g), xylene (12 L), palladium (II) acetate (11.5 g), tri-tert-butylphosphonium tetrame Fluoroborate (29.8 g) and sodium tert-butoxide (555 g) were added and stirred for 40 hours under heating to reflux. Then, the obtained reaction liquid was filtered by the filter which covered silica gel and celite, and also the filter which covered silica gel and celite was washed with toluene (10 L). The obtained filtrate was washed 5 times with ion exchange water (4 L), and the obtained organic layer was dried over anhydrous sodium sulfate and filtered. The obtained filtrate was concentrated under reduced pressure to obtain a solid. The obtained solid was recrystallized with toluene and then dried under reduced pressure at 50 ° C. to obtain crude purified product HM-1 (361 g). The HPLC area percentage value of the crudely purified product HM-1 was 99.5% or more.

The resulting crude purified product HM-1 (86 g) was purified by sublimation five times to obtain a compound HM-1 (21 g). In addition, in the case of sublimation purification, the degree of vacuum was 5 × 10 ⁻³ Pa, and the sublimation temperature was 290 ° C.

The HPLC area percentage value of compound HM-1 was 99.5% or more. Moreover, the quantity (C ^H ) of the chlorine atom contained in the compound HM-1 was below the detection limit (0 mass ppm). Moreover, the quantity of the bromine atom contained in compound HM-1 was below the detection limit (0 mass ppm). Compound HM-1 was used as a host material.

Comparative Example 1 and Example 1 Synthesis of Phosphorescent Compounds MC1 and MC2

  The inside of the reaction vessel shielded from light is made into an argon gas atmosphere, and then the phosphorescent compound MC1a (210 g), phenylboronic acid (63.1 g), dichlorobis (tris-o-methoxyphenylphosphine) palladium (II) (0.69 g) And toluene (2.1 kg) were added and heated to 70.degree. After adding 20 mass% tetraethylammonium hydroxide aqueous solution (1.39 kg) to there, it stirred at 90 degreeC for 19 hours. Thereafter, the reaction solution was cooled to room temperature, and then 10% by mass brine was added, followed by filtration with a filter covered with celite. The obtained filtrate was extracted with toluene and 10% by mass brine to obtain an organic layer. The obtained organic layer was dried over anhydrous magnesium sulfate and filtered through a filter covered with amino silica gel. The obtained filtrate was concentrated under reduced pressure to obtain a solid. The obtained solid was recrystallized with a mixed solvent of toluene and acetonitrile, and then filtered to obtain a filtrate MC1 'and a residue MC2'. The obtained filtrate MC1 'was concentrated under reduced pressure to obtain a solid MC1'. The obtained solid MC1 'was dried at 50 ° C under reduced pressure to obtain a phosphorescent compound MC1 (81.8 g) of Comparative Example 1. Further, the obtained residue MC2 'was dried at 50 ° C. under reduced pressure to obtain the phosphorescent compound MC2 (125 g) of Example 1.

  The HPLC area percentage value of the phosphorescent compound MC1 was 99.2%. The HPLC area percentage value of the phosphorescent compound MC2 was 99.5% or more.

The amount (C ¹ ) of chlorine atoms contained in the phosphorescent compound MC1 was 16 mass ppm. The amount (C ¹ ) of chlorine atoms contained in the phosphorescent compound MC2 was 9 mass ppm.

  The amount of bromine atoms contained in the phosphorescent compound MC1 was 2 mass ppm. The amount of bromine atoms contained in the phosphorescent compound MC2 was less than the detection limit (0 mass ppm).

  The maximum peak wavelength of the emission spectrum of the phosphorescent compounds MC1 and MC2 was 471 nm.

<Example 2> Synthesis of phosphorescent compound MC3

  Dehalogenation of the phosphorescent compound MC2 was performed. Specifically, the inside of the light-shielded reaction vessel is changed to an argon gas atmosphere, and then the phosphorescent compound MC2 (40.0 g), phenylboronic acid (3.67 g), (di-tert-butyl (4-dimethylaminophenyl) ) Phosphine) Dichloropalladium (II) (0.64 g) and toluene (210 mL) were added and heated to 90 ° C. After adding 40 mass% tetrabutyl ammonium hydroxide aqueous solution (97 mL) there, it stirred at 90 degreeC for 120 hours. Thereafter, the reaction solution was cooled to room temperature, and then the aqueous layer was removed to obtain an organic layer. The obtained organic layer was washed twice with ion exchanged water (100 mL), dried over anhydrous magnesium sulfate, filtered, and the residue was washed with toluene (250 mL). The obtained filtrate was concentrated under reduced pressure to obtain a solid. The obtained solid was purified by silica gel column chromatography (mixed solvent of hexane and dichloromethane) and then recrystallized with a mixed solvent of toluene and acetonitrile. The obtained solid was dried under reduced pressure at 50 ° C. to obtain the phosphorescent compound MC3 (34.2 g) as a yellow solid.

The HPLC area percentage value of the phosphorescent compound MC3 was 99.5% or more. In addition, the amount (C ¹ ) of chlorine atoms contained in the phosphorescent compound MC3 was less than the detection limit (0 mass ppm). The amount of bromine atoms contained in the phosphorescent compound MC3 was less than the detection limit (0 mass ppm).

¹ H-NMR and LC-MS of the phosphorescent compound MC3 were as follows.
¹ H-NMR (300 MHz, CD ₂ Cl _2- d ₂ ) δ (ppm) = 7.83-7.85 (m, 6 H), 7.67-7.54 (m, 12 H), 7.5 2- 7.43 (m, 3H), 6.94 (d, 6H), 6.80 (d, 3H), 6.67 (t, 3H), 6.52 (t, 3H), 6.44-6 .36 (m, 3 H), 2.94-2.74 (m, 3 H), 2.55-2.36 (m, 3 H), 1. 35 (d, 9 H), 1.19-1.09 (M, 18H), 1.06 (d, 9H).
LC-MS (APCI, positive): m / z = 1331.6 [M + H] ⁺

  The maximum peak wavelength of the emission spectrum of the phosphorescent compound MC3 was 471 nm.

Example D1 Production and Evaluation of Light-Emitting Element D1 (Production of Light-Emitting Element D1)
(Formation of anode and hole injection layer)
An anode was formed by depositing an ITO film with a thickness of 45 nm on a glass substrate by sputtering. On the anode, a hole injection material ND-3202 (manufactured by Nissan Chemical Industries, Ltd.) was deposited to a thickness of 35 nm by spin coating. The hole injection layer was formed by heating at 50 ° C. for 3 minutes on a hot plate and further heating at 230 ° C. for 15 minutes in an air atmosphere.

(Formation of hole transport layer)
The polymer compound HTL-1 was dissolved in xylene at a concentration of 0.7% by mass. Using the obtained xylene solution, a film is formed on the hole injection layer to a thickness of 20 nm by spin coating, and the holes are heated at 180 ° C. for 60 minutes on a hot plate under a nitrogen gas atmosphere. A transport layer was formed.

(Formation of light emitting layer D1)
Compound HM-1 and phosphorescent compound MC3 (compound HM-1 / phosphorescent compound MC3 = 75% by mass / 25% by mass) were added to toluene (manufactured by Kanto Chemical Co., Ltd .: for electronic industry (EL grade)). It was dissolved at a concentration of 0% by mass. Using the obtained toluene solution, a film was formed to a thickness of 75 nm by spin coating on the hole transport layer, and a light emitting layer was formed by heating at 130 ° C. for 10 minutes in a nitrogen gas atmosphere.
In the theoretical value determined from the amount of charging, C ¹ is 0 mass ppm, C ^H is 0 mass ppm, W ¹ is 0.25, and W ^H is 0.75, C ¹ W ¹ + C 3 ^H W ^H is 0 mass ppm.

(Formation of electron transport layer)
The polymer compound ETL-1 was dissolved in 2,2,3,3,4,4,5,5-octafluoro-1-pentanol at a concentration of 0.25% by mass. Using the resulting 2,2,3,3,4,4,5,5-octafluoro-1-pentanol solution, form a film with a thickness of 10 nm on the light emitting layer by spin coating, The electron transport layer was formed by heating at 130 ° C. for 10 minutes in a gas atmosphere.

(Formation of cathode)
After reducing the pressure of the substrate on which the electron transport layer is formed to 1.0 × 10 ⁻⁴ Pa or less in a vapor deposition machine, sodium fluoride of about 4 nm is formed on the electron transport layer as a cathode, and then a sodium fluoride layer is formed. About 80 nm of aluminum was vapor-deposited thereon. After vapor deposition, sealing was performed using a glass substrate, to fabricate a light emitting device D1.

(Evaluation of light emitting element)
EL light emission was observed by applying a voltage to the light emitting device D1. The luminous efficiency at 100 cd / m ² was 4.98 [lm / W], and the CIE chromaticity coordinates (x, y) were (0.19, 0.42). The CIE chromaticity coordinates (x, y) at 1000 cd / m ² were (0.20, 0.44). The CIE chromaticity coordinate (x, y) at 5000 cd / m ² was (0.19, 0.42). After setting the current value so that the initial luminance is 1000 cd / m ² and driving with a constant current, the time until the luminance reaches 95% of the initial luminance (hereinafter, also referred to as “LT95”) is measured. It was 229 hours. After setting the current value so that the initial luminance is 5000 cd / m ² and driving with a constant current, the time until the luminance reaches 50% of the initial luminance (hereinafter also referred to as “LT50”) is measured. It was 25.3 hours. The results are shown in Table 5.

Example D2 Production and Evaluation of Light-Emitting Element D2 (Production of Light-Emitting Element D2)
A light emitting device D2 was produced in the same manner as in Example D1, except that (Formation D1 of the light emitting layer) in Example D1 was changed to (Formation D2 of the light emitting layer).

(Formation of light emitting layer D2)
Compound HM-1, phosphorescent compound MC3 and phosphorescent compound MC2 (compound HM-1 / phosphorescent compound MC3 / phosphorescent compound MC2) in toluene (Kanto Chemical Co., Ltd .: for electronic industry (EL grade)) = 75% by weight / 22.5% by weight / 2.5% by weight) were dissolved at a concentration of 2.0% by weight. Using the obtained toluene solution, a film was formed to a thickness of 75 nm by spin coating on the hole transport layer, and a light emitting layer was formed by heating at 130 ° C. for 10 minutes in a nitrogen gas atmosphere.
In the theoretical values calculated from the amount of the charge, ^{C 1} is 0.90 mass ppm, ^{C H} is 0 mass ppm, ^{W 1} is 0.25, ^{W H} is 0.75, C ¹ W ¹ + C 2 ^H W ^H is 0.23 mass ppm.

(Evaluation of light emitting element)
EL light emission was observed by applying a voltage to the light emitting element D2. The luminous efficiency at 100 cd / m ² was 7.60 [lm / W], and the CIE chromaticity coordinates (x, y) were (0.20, 0.44). The CIE chromaticity coordinates (x, y) at 1000 cd / m ² were (0.20, 0.44). The CIE chromaticity coordinate (x, y) at 5000 cd / m ² was (0.19, 0.42). After setting the current value so that the initial luminance is 1000 cd / m ² , driving was performed with a constant current, and the time until the luminance reached 95% of the initial luminance was measured, which was 124 hours. The current value was set so that the initial luminance was 5000 cd / m ^2, and driving was performed with a constant current, and the time until the luminance reached 50% of the initial luminance was measured, which was 24.5 hours. The results are shown in Table 5.

Example D3 Production and Evaluation of Light-Emitting Element D3 (Production of Light-Emitting Element D3)
A light emitting device D3 was produced in the same manner as in Example D1, except that (Formation D1 of the light emitting layer) in Example D1 was changed to (Formation D3 of the light emitting layer).

(Formation of light emitting layer D3)
Compound HM-1, phosphorescent compound MC3 and phosphorescent compound MC2 (compound HM-1 / phosphorescent compound MC3 / phosphorescent compound MC2) in toluene (Kanto Chemical Co., Ltd .: for electronic industry (EL grade)) = 75% by weight / 12.5% by weight / 12.5% by weight) were dissolved at a concentration of 2.0% by weight. Using the obtained toluene solution, a film was formed to a thickness of 75 nm by spin coating on the hole transport layer, and a light emitting layer was formed by heating at 130 ° C. for 10 minutes in a nitrogen gas atmosphere.
In the theoretical values calculated from the amount of the charge, ^{C 1} is 4.50 mass ppm, ^{C H} is 0 mass ppm, ^{W 1} is 0.25, ^{W H} is 0.75, C ¹ W ¹ + C 2 ^H W ^H is 1.13 mass ppm.

(Evaluation of light emitting element)
EL light emission was observed by applying a voltage to the light emitting element D3. The luminous efficiency at 100 cd / m ² was 8.07 [lm / W], and the CIE chromaticity coordinates (x, y) were (0.19, 0.43). The CIE chromaticity coordinate (x, y) at 1000 cd / m ² was (0.19, 0.43). The CIE chromaticity coordinate (x, y) at 5000 cd / m ² was (0.19, 0.42). After setting the current value so that the initial luminance is 1000 cd / m ² , driving was performed with a constant current, and the time until the luminance reached 95% of the initial luminance was measured, which was 41 hours. After setting the current value so as to give an initial luminance of 5000 cd / m ² , driving was performed with a constant current, and the time taken for the luminance to reach 50% of the initial luminance was 24.8 hours. The results are shown in Table 5.

Example D4 Preparation and Evaluation of Light Emitting Element D 4 (Preparation of Light Emitting Element D 4)
A light emitting device D4 was produced in the same manner as in Example D1, except that (Formation D1 of the light emitting layer) in Example D1 was changed to (Formation D4 of the light emitting layer).

(Formation of light emitting layer D4)
Compound HM-1 and phosphorescent compound MC2 (compound HM-1 / phosphorescent compound MC2 = 75% by mass / 25% by mass) were added to toluene (manufactured by Kanto Chemical Co., Ltd .: for electronic industry (EL grade)). It was dissolved at a concentration of 0% by mass. Using the obtained toluene solution, a film was formed to a thickness of 75 nm by spin coating on the hole transport layer, and a light emitting layer was formed by heating at 130 ° C. for 10 minutes in a nitrogen gas atmosphere.
In the theoretical values calculated from the amount of the charge, ^{C 1} is 9.00 mass ppm, ^{C H} is 0 mass ppm, ^{W 1} is 0.25, ^{W H} is 0.75, C ¹ W ¹ + C 2 ^H W ^H is 2.25 mass ppm.

(Evaluation of light emitting element)
EL light emission was observed by applying a voltage to the light emitting device D4. The luminous efficiency at 100 cd / m ² was 8.48 [lm / W], and the CIE chromaticity coordinates (x, y) were (0.20, 0.44). The CIE chromaticity coordinates (x, y) at 1000 cd / m ² were (0.20, 0.44). The CIE chromaticity coordinate (x, y) at 5000 cd / m ² was (0.19, 0.41). After setting the current value so that the initial luminance is 1000 cd / m ² , driving was performed with a constant current, and the time until the luminance reached 95% of the initial luminance was measured, which was 18 hours. After setting the current value so that the initial luminance is 5000 cd / m ² , driving was performed with a constant current, and the time until the luminance became 50% of the initial luminance was measured, which was 24.4 hours. The results are shown in Table 5.

Example D5 Production and Evaluation of Light-Emitting Element D5 (Production of Light-Emitting Element D5)
A light emitting device D5 was produced in the same manner as in Example D1, except that (Formation D1 of the light emitting layer) in Example D1 was changed to (Formation D5 of the light emitting layer).

(Formation of light emitting layer D5)
Compound HM-1, phosphorescent compound MC2 and phosphorescent compound MC1 (compound HM-1 / phosphorescent compound MC2 / phosphorescent compound MC1) in toluene (Kanto Chemical Co., Ltd .: for electronic industry (EL grade)) = 75% by weight / 12.5% by weight / 12.5% by weight) were dissolved at a concentration of 2.0% by weight. Using the obtained toluene solution, a film was formed to a thickness of 75 nm by spin coating on the hole transport layer, and a light emitting layer was formed by heating at 130 ° C. for 10 minutes in a nitrogen gas atmosphere.
In the theoretical values calculated from the amount of the charge, ^{C 1} is 12.5 mass ppm, ^{C H} is 0 mass ppm, ^{W 1} is 0.25, ^{W H} is 0.75, C ¹ W ¹ + C 2 ^H W ^H is 3.13 mass ppm.

(Evaluation of light emitting element)
EL light emission was observed by applying a voltage to the light emitting element D5. The luminous efficiency at 100 cd / m ² was 6.34 [lm / W], and the CIE chromaticity coordinates (x, y) were (0.19, 0.42). The CIE chromaticity coordinate (x, y) at 1000 cd / m ² was (0.19, 0.43). The CIE chromaticity coordinate (x, y) at 5000 cd / m ² was (0.19, 0.41). After setting the current value so that the initial luminance is 1000 cd / m ² , driving with a constant current and measuring the time until the luminance reaches 95% of the initial luminance was 8.3 hours. The current value was set so that the initial luminance was 5000 cd / m ^2, and driving was performed with a constant current, and the time until the luminance reached 50% of the initial luminance was measured, which was 24.0 hours. The results are shown in Table 5.

Comparative Example CD1 Production and Evaluation of Light-Emitting Element CD1 (Production of Light-Emitting Element CD1)
A light emitting element CD1 was produced in the same manner as in Example D1 except that (Formation D1 of the light emitting layer) in Example D1 was changed to (Formation CD1 of the light emitting layer).

(Formation of light emitting layer CD1)
Compound HM-1 and phosphorescent compound MC1 (compound HM-1 / phosphorescent compound MC1 = 75% by mass / 25% by mass) were added to toluene (manufactured by Kanto Chemical Co., Ltd .: for electronic industry (EL grade)). It was dissolved at a concentration of 0% by mass. Using the obtained toluene solution, a film was formed to a thickness of 75 nm by spin coating on the hole transport layer, and a light emitting layer was formed by heating at 130 ° C. for 10 minutes in a nitrogen gas atmosphere.
In the theoretical values calculated from the amount of the charge, ^{C 1} is 16.0 mass ppm, ^{C H} is 0 mass ppm, ^{W 1} is 0.25, ^{W H} is 0.75, C ¹ W ¹ + C 2 ^H W ^H is 4.00 mass ppm.

(Evaluation of light emitting element)
EL light emission was observed by applying a voltage to the light emitting element CD1. The luminous efficiency at 100 cd / m ² was 6.33 [lm / W], and the CIE chromaticity coordinates (x, y) were (0.19, 0.41). The CIE chromaticity coordinates (x, y) at 1000 cd / m ² were (0.20, 0.43). The CIE chromaticity coordinate (x, y) at 5000 cd / m ² was (0.19, 0.41). After setting the current value so that the initial luminance is 1000 cd / m ² , driving was performed with a constant current, and the time until the luminance reached 95% of the initial luminance was measured, which was 5.3 hours. After setting the current value so as to give an initial luminance of 5000 cd / m ² , it was driven by a constant current, and the time taken for the luminance to reach 50% of the initial luminance was 26.3 hours. The results are shown in Table 5.

Claims (19)

A composition in which a phosphorescent compound represented by the formula (1) and a host material are blended,
The phosphorescent compound is a compound having a maximum peak wavelength of emission spectrum of 380 nm or more and less than 495 nm,
The composition whose quantity of the chlorine atom contained as an impurity in the said phosphorescent compound is 3.5 mass ppm or less with respect to solid content whole quantity mix | blended with the said composition.

[In the formula,
M ¹ represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom.
n ¹ represents an integer of 1 or more, n ² represents an integer of 0 or more, and n ¹ + n ² is 2 or 3. When M ¹ is a rhodium atom or an iridium atom, n ¹ + n ² is 3, and when M ¹ is a palladium atom or a platinum atom, n ¹ + n ² is 2.
E ¹ and E ² each independently represent a carbon atom or a nitrogen atom. However, at least one of E ¹ and E ² is a carbon atom.
Ring R ¹ represents a diazole ring or a triazole ring, the ring may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When two or more rings R ¹ exist, they may be the same or different.
The ring R ² represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When a plurality of rings R ² exist, they may be the same or different.
The substituent which ring R ¹ may have and the substituent which ring R ² may have may be bonded to each other to form a ring together with the atoms to which they are attached.
A ¹ -G ¹ -A ² represents an anionic bidentate ligand. Each of A ¹ and A ² independently represents a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be atoms constituting a ring. G ¹ represents a single bond or an atomic group constituting a bidentate ligand with A ¹ and A ² . When ^two or more A ¹ -G ¹ -A ² are present, they may be the same or different. ]   The total amount of the chlorine atom contained as an impurity in the phosphorescent compound and the chlorine atom contained as an impurity in the host material is 3.5 mass ppm or less based on the total mass of the solid content compounded in the composition. The composition of claim 1.   The composition according to claim 2, wherein the total amount of chlorine atoms is 0.8 mass ppm or less with respect to the total amount of solid content blended in the composition.   The composition according to claim 2, wherein the total amount of chlorine atoms is 0.01 mass ppm or more and 3.0 mass ppm or less with respect to the total amount of solid content mixed in the composition.   The composition according to any one of claims 2 to 4, wherein the total amount of chlorine atoms is 0.1 mass ppm or more and 0.8 mass ppm or less with respect to the total amount of solid content mixed in the composition. object. The composition according to any one of claims 1 to 5, wherein the phosphorescent compound is a compound represented by formula (1-A).

[In the formula,
M ¹ , n ¹ , n ² , E ¹ and A ¹ -G ¹ -A ² have the same meanings as described above.
E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A each independently represent a nitrogen atom or a carbon atom. When there are a plurality of E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A , they may be the same or different. When E ^11A is a nitrogen atom, R ^11A may be present or absent. When E ^12A is a nitrogen atom, R ^12A may be present or absent. When E ^13A is a nitrogen atom, R ^13A may be present or absent. When E ^21A is a nitrogen atom, R ^21A is absent. When E ^22A is a nitrogen atom, R ^22A is absent. When E ^23A is a nitrogen atom, R ^23A is absent. When E ^24A is a nitrogen atom, R ^24A is absent.
R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, It represents a monovalent heterocyclic group, a substituted amino group or a fluorine atom, and these groups may have a substituent. When a plurality of R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are present, they may be the same or different. R ^11A and R ^12A , R ^12A and R ^13A , R ^11A and R ^21A , R ^21A and R ^22A , R ^22A and R ^23A , and R ^23A and R ^24A are each bonded together with an atom to which each is bonded It may form a ring.
Ring R ^1A represents a triazole ring or a diazole ring composed of a nitrogen atom, E ¹ , E ^11A , E ^12A and E ^13A .
Ring R ^2A represents a benzene ring, a pyridine ring or a pyrimidine ring composed of two carbon atoms, E ^21A , E ^22A , E ^23A and E ^24A . ] The phosphorescent compound is a compound represented by the formula (1-A1), a compound represented by the formula (1-A2), a compound represented by the formula (1-A3) or the formula (1-A4) The composition according to claim 6, which is a compound represented.

[Wherein, M ¹ , n ¹ , n ² , R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A , R ^24A and A ¹ -G ¹ -A ² have the same meanings as described above] . ] The phosphorescent compound is a compound represented by the formula (1-A3),
The composition according to claim 7, wherein R ^11A is an aryl group which may have a substituent. The composition according to any one of claims 1 to 8, wherein the host material is a compound represented by formula (H-1).

[In the formula,
Ar ^H1 and Ar ^H2 each independently represent an aryl group or a monovalent heterocyclic group, and these groups may have a substituent.
n ^H1 and n ^H2 each independently represent 0 or 1. When there are a plurality of n ^H1 , they may be the same or different. Plural n ^H2 may be the same or different.
n ^H3 represents an integer of 0 or more.
L ^H1 represents an arylene group, a divalent heterocyclic group, or a group represented ^by- [C (R ^H11 ) ₂ ] n ^H11- , and these groups may have a substituent. When two or more L ^H1 are present, they may be the same or different.
n ^H11 represents an integer of 1 or more and 10 or less. R ^H11 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. A plurality of R ^H11 may be the same or different, and may be bonded to each other to form a ring together with the carbon atoms to which they are bonded.
L ^H2 represents a group represented by -N (-L ^H21 -R ^H21 )-. When two or more L ^H2 are present, they may be the same or different.
L ^H21 represents a single bond, an arylene group or a divalent heterocyclic group, and these groups may have a substituent. R ^H21 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group, and these groups may have a substituent. ]   The film according to any one of claims 1 to 8, further comprising at least one material selected from the group consisting of a hole transport material, a hole injection material, an electron transport material, an electron injection material, a light emitting material, an antioxidant and a solvent. The composition according to one item. A phosphorescent compound represented by the formula (1), which is
The phosphorescent compound is a compound having a maximum peak wavelength of emission spectrum of 380 nm or more and less than 495 nm,
The phosphorescent compound whose quantity of the chlorine atom contained as an impurity is 15 mass ppm or less with respect to the whole quantity of the said phosphorescent compound.

[In the formula,
M ¹ represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom.
n ¹ represents an integer of 1 or more, n ² represents an integer of 0 or more, and n ¹ + n ² is 2 or 3. When M ¹ is a rhodium atom or an iridium atom, n ¹ + n ² is 3, and when M ¹ is a palladium atom or a platinum atom, n ¹ + n ² is 2.
E ¹ and E ² each independently represent a carbon atom or a nitrogen atom. However, at least one of E ¹ and E ² is a carbon atom.
Ring R ¹ represents a diazole ring or a triazole ring, the ring may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When two or more rings R ¹ exist, they may be the same or different.
The ring R ² represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and these rings may have a substituent. When two or more substituents are present, they may be the same or different, and may be bonded to each other to form a ring together with the atoms to which they are bonded. When a plurality of rings R ² exist, they may be the same or different.
The substituent which ring R ¹ may have and the substituent which ring R ² may have may be bonded to each other to form a ring together with the atoms to which they are attached.
A ¹ -G ¹ -A ² represents an anionic bidentate ligand. Each of A ¹ and A ² independently represents a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be atoms constituting a ring. G ¹ represents a single bond or an atomic group constituting a bidentate ligand with A ¹ and A ² . When ^two or more A ¹ -G ¹ -A ² are present, they may be the same or different. ] The phosphorescent compound according to claim 11, wherein the phosphorescent compound represented by the formula (1) is a compound represented by the formula (1-A).

[In the formula,
M ¹ , n ¹ , n ² , E ¹ and A ¹ -G ¹ -A ² have the same meanings as described above.
E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A each independently represent a nitrogen atom or a carbon atom. When there are a plurality of E ^11A , E ^12A , E ^13A , E ^21A , E ^22A , E ^23A and E ^24A , they may be the same or different. When E ^11A is a nitrogen atom, R ^11A may be present or absent. When E ^12A is a nitrogen atom, R ^12A may be present or absent. When E ^13A is a nitrogen atom, R ^13A may be present or absent. When E ^21A is a nitrogen atom, R ^21A is absent. When E ^22A is a nitrogen atom, R ^22A is absent. When E ^23A is a nitrogen atom, R ^23A is absent. When E ^24A is a nitrogen atom, R ^24A is absent.
R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, It represents a monovalent heterocyclic group, a substituted amino group or a fluorine atom, and these groups may have a substituent. When a plurality of R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A and R ^24A are present, they may be the same or different. R ^11A and R ^12A , R ^12A and R ^13A , R ^11A and R ^21A , R ^21A and R ^22A , R ^22A and R ^23A , and R ^23A and R ^24A are each bonded together with an atom to which each is bonded It may form a ring.
Ring R ^1A represents a triazole ring or a diazole ring composed of a nitrogen atom, E ¹ , E ^11A , E ^12A and E ^13A .
Ring R ^2A represents a benzene ring, a pyridine ring or a pyrimidine ring composed of two carbon atoms, E ^21A , E ^22A , E ^23A and E ^24A . ] The phosphorescent compound is a compound represented by the formula (1-A1), a compound represented by the formula (1-A2), a compound represented by the formula (1-A3) or the formula (1-A4) The phosphorescent compound according to claim 12, which is a compound represented.

[Wherein, M ¹ , n ¹ , n ² , R ^11A , R ^12A , R ^13A , R ^21A , R ^22A , R ^23A , R ^24A and A ¹ -G ¹ -A ² have the same meanings as described above] . ] The phosphorescent compound is a compound represented by the formula (1-A3),
^14. The phosphorescent compound according to claim 13, wherein said R ^11A is an aryl group which may have a substituent.   The phosphorescence-emitting compound as described in any one of Claims 11-14 whose quantity of the chlorine atom contained as said impurity is 0.9 mass ppm or less.   The phosphorescence-emitting compound as described in any one of Claims 11-14 whose quantity of the chlorine atom contained as said impurity is 0.01 mass ppm or more and 12 mass ppm or less.   The phosphorescent compound according to claim 15 or 16, wherein the amount of chlorine atoms contained as the impurity is 0.1 mass ppm or more and 0.9 mass ppm or less.   The light emitting element provided with the organic layer containing the composition as described in any one of Claims 1-10. The light emitting element provided with the organic layer by which the phosphorescence-emitting compound as described in any one of Claims 11-17 was mix | blended.